Week 8 Final Exam-
scored 128 out of 160= 80%
QUESTION 1
Of the following pairs of events, which pair has mutually exclusive events?
rolling a sum
... [Show More] greater than 7 from two rolls of a standard die and rolling a 4 for the first throw
drawing a 2 and drawing a 4 with replacement from a standard deck of cards rolling a sum of 9 from two rolls of a standard die and rolling a 2 for the first roll drawing a red card and then drawing a black card with replacement from a standard
deck of cards
QUESTION 2
Hugo averages 41 words per minute on a typing test with a standard deviation of 7.5 words per minute. Suppose Hugo's words per minute on a typing test are normally distributed. Let X= the number of words per minute on a typing test.
Then, X∼N(41,7.5).
Suppose Hugo types 45 words per minute in a typing test on Wednesday. The z-score when x=45 is . This z-score tells you that x=45 is standard
deviations to the (right/left) of the mean, .
Correctly fill in the blanks in the statement above. Select the correct answer below:
Suppose Hugo types 45 words per minute in a typing test on Wednesday. The z- score when x=45 is −0.533. This z-score tells you that x=45 is 0.533 standard deviations to the left of the mean, 41.
Suppose Hugo types 45 words per minute in a typing test on Wednesday. The z- score when x=45 is −0.381. This z-score tells you that x=45 is 0.381 standard deviations to the left of the mean, 41.
Suppose Hugo types 45 words per minute in a typing test on Wednesday. The z- score when x=45 is 0.381. This z-score tells you that x=45 is 0.381 standard deviations to the right of the mean, 41.
Suppose Hugo types 45 words per minute in a typing test on Wednesday. The z- score when x=45 is 0.533. This z-score tells you that x=45 is 0.533 standard deviations to the right of the mean, 41.
QUESTION 3
A fitness center claims that the mean amount of time that a person spends at the gym per visit is 33 minutes. Identify the null hypothesis, H0, and the alternative hypothesis, Ha, in terms of the parameter μ.
Select the correct answer below:
H0: μ≠33; Ha: μ=33 H0: μ=33; Ha: μ≠33 H0: μ≥33; Ha: μ<33 H0: μ≤33; Ha: μ>33
QUESTION 4
A recent study suggested that 81% of senior citizens take at least one prescription medication. Amelia is a nurse at a large hospital who would like to know whether the
percentage is the same for senior citizen patients who go to her hospital. She randomly selects 59 senior citizens patients who were treated at the hospital and finds
that 49 of them take at least one prescription medication. What are the null and alternative hypotheses for this hypothesis test?
{H0:p=0.81Ha:p>0.81
{H0:p≠0.81Ha:p=0.81
{H0:p=0.81Ha:p<0.81
{H0:p=0.81Ha:p≠0.81
QUESTION 5
A doctor notes her patient's temperature in degrees Fahrenheit every hour to make sure the patient does not get a fever. What is the level of measurement of the data.
nominal ordinal interval ratio
QUESTION 6
Assume the null hypothesis, H0, is: Jacob earns enough money to afford a luxury apartment. Find the Type I error in this scenario.
Jacob thinks he does not earn enough money to afford the luxury apartment when, in fact, he does.
Jacob thinks he does not earn enough money to afford the luxury apartment when, in fact, he does not.
Jacob thinks he earns enough money to afford the luxury apartment when, in fact, he does
not.
Jacob thinks he earns enough money to afford the luxury apartment when, in fact, he does.
QUESTION 7
The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we want to be 95% confident that the sample mean is
within 2 inches of the true population mean, what is the minimum sample size that can be taken?
z0.101.282z0.051.645z0.0251.960z0.012.326z0.0052.576
Use the table above for the z-score, and be sure to round up to the nearest integer.
ANSWER: 25 DOG HEIGHTS
QUESTION 8
Alice sells boxes of candy at the baseball game and wants to know the mean number of boxes she sells. The numbers for the games so far are listed below.
16,14,14,21,15
Find the mean boxes sold.
ANSWER: MEAN= 16 BOXES
QUESTION 9
To test the effectiveness of a drug proposed to relieve symptoms of headache, physicians included participants for a study. They gave the drug to one group and a drug with no therapeutic effect to another group. Which group receives the placebo?
the physicians
the group that received the drug for headache
the group that received the drug with no therapeutic effect all of the people in the study
QUESTION 10
John owns a computer repair service. For each computer, he charges $50 plus $45 per hour of work. A linear equation that expresses the total amount of money John earns per computer
is y=50+45x. What are the independent and dependent variables? What is the y-intercept and the slope?
The independent variable (x) is the amount of time John fixes a computer. The dependent variable (y) is the amount, in dollars, John earns for a computer.
John charges a one-time fee of $50 (this is when x=0), so the y-intercept is 50. John earns $45 for each hour he works, so the slope is 45.
The independent variable (x) is the amount, in dollars, John earns for a computer. The dependent variable (y) is the amount of time John fixes a computer.
John charges a one-time fee of $45 (this is when x=0), so the y-intercept is 45. John earns $50 for each hour he works, so the slope is 50.
The independent variable (x) is the amount, in dollars, John earns for a computer. The dependent variable (y) is the amount of time John fixes a computer.
John charges a one-time fee of $50 (this is when x=0), so the y-intercept is 50. John earns $45 for each hour he works, so the slope is 45.
The independent variable (x) is the amount of time John fixes a computer. The dependent variable (y) is the amount, in dollars, John earns for a computer.
John charges a one-time fee of $45 (this is when x=0), so the y-intercept is 45. John earns $50 for each hour he works, so the slope is 50.
QUESTION 11
Brayden tosses a coin 500 times. Of those 500 times, he observes heads a total
of 416 times. Calculations show that the probability of this occurring by chance is less than 0.01, assuming the coin is fair. Determine the meaning of the significance level.
We expect that 416 of every 500 coin tosses will result in heads. At the 0.01 level of significance, the coin is likely not a fair coin. There is certainty that the coin is not a fair coin.
The results are not statistically significant at the 0.05 level of significance.
QUESTION 12
A researcher claims that the proportion of cars with manual transmission is less than 10%. To test this claim, a survey checked 1000 randomly selected cars. Of those cars, 95 had a manual transmission.
The following is the setup for the hypothesis test:
{H0:p=0.10Ha:p<0.10
Find the test statistic for this hypothesis test for a proportion. Round your answer to 2 decimal places.
ANSWER: -0.53
QUESTION 13
An economist claims that the proportion of people who plan to purchase a fully electric vehicle as their next car is greater than 65%.
To test this claim, a random sample of 750 people are asked if they plan to purchase a fully electric vehicle as their next car Of these 750 people, 513 indicate that they do
plan to purchase an electric vehicle.
The following is the setup for this hypothesis test:
H0:p=0.65 Ha:p>0.65
In this example, the p-value was determined to be 0.026.
Come to a conclusion and interpret the results for this hypothesis test for a proportion (use a significance level of 5%.)
The decision is to reject the Null Hypothesis.
The conclusion is that there is enough evidence to support the claim.
The decision is to fail to reject the Null Hypothesis.
The conclusion is that there is not enough evidence to support the claim.
QUESTION 14
A medical researcher claims that the proportion of people taking a certain medication that develop serious side effects is 12%. To test this claim, a random sample of 900 people taking the medication is taken and it is determined that 93 people have experienced serious side effects. .
The following is the setup for this hypothesis test:
H0:p = 0.12
Ha:p ≠ 0.12
Find the p-value for this hypothesis test for a proportion and round your answer to 3 decimal places.
The following table can be utilized which provides areas under the Standard Normal Curve:
z 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09
-1.8 0.036 0.035 0.034 0.034 0.033 0.032 0.031 0.031 0.030 0.029
-1.7 0.045 0.044 0.043 0.042 0.041 0.040 0.039 0.038 0.038 0.037
-1.6 0.055 0.054 0.053 0.052 0.051 0.049 0.048 0.047 0.046 0.046
-1.5 0.067 0.066 0.064 0.063 0.062 0.061 0.059 0.058 0.057 0.056
-1.4 0.081 0.079 0.078 0.076 0.075 0.074 0.072 0.071 0.069 0.068
ANSWER: 0.062
QUESTION 15
•
1 POINT
The weight of a car can influence the mileage that the car can obtain. A random sample of 20 cars’ weights and mileage is collected. The table for the weight and mileage of
the cars is given below. Use Excel to find the best fit linear regression equation, where weight is the explanatory variable. Round the slope and intercept to three decimal places.
30.0
32.2
20.0
56.0
20.0
46.2
45.0
19.5
40.0
23.6
45.0
16.7
25.0
42.2
55.0
13.2
17.5
65.4
HelpCopy to ClipboardDownload CSV
ANSWER: ŷ = -1.181X + 71.374
QUESTION 16
Which of the following results in the null hypothesis μ≥38 and alternative hypothesis μ<38?
A fitness center claims that the mean amount of time that a person spends at the gym per visit is at most 38 minutes.
A fitness center claims that the mean amount of time that a person spends at the gym per visit is fewer than 38 minutes.
A fitness center claims that the mean amount of time that a person spends at the gym per visit is 38 minutes.
A fitness center claims that the mean amount of time that a person spends at the gym per visit is more than 38 minutes.
QUESTION 17
Which of the following are feasible equations of a least squares regression line for the annual population change of a small country from the year 2000 to the year 2015?
Select all that apply.
yˆ=38,000+2500x
yˆ=38,000−3500x yˆ=−38,000+2500x
yˆ=38,000−1500x
QUESTION 18
A poll was conducted during the final game of the basketball season to determine
whether fans wanted to see the defending champions win the game or the challenging team win the game. From the poll, 216 of the 374 residents sampled from urban areas want the defending champions to win the game. In more rural areas, 304 of the 466 residents polled want the defending champions to win the game. Assuming
location has nothing to do with team preference, the probability that the data gathered was the result of chance is calculated to be 0.03. What is the correct interpretation of
this calculation?
More people from rural areas want the defending champions to win the game.
Exactly 216 out of every 374 urban residents want the defending champions to win the game.
The results are statistically significant at the 0.05 level of significance in showing that the proportion of people in rural areas who want the defending champions to win the game is different than the proportion of people in urban areas.
The data is not statistically significant at the 0.05 level of significance in showing that the proportion of people in rural areas who want the defending champions to win the game is different than the proportion of people in urban areas.
QUESTION 19
In a psychological study aimed at testing a drug that reduces anxiety, the researcher grouped the participants into 2 groups and gave the anxiety-reduction pill to one group
and an inert pill to another group. Which group receives the placebo?
the group that received the anxiety-reduction pill the psychological study
all the people in the study
the group that received the inert pill
QUESTION 20
A statistics professor recently graded final exams for students in her introductory statistics course. In a review of her grading, she found the mean score out
of 100 points was a x¯=77, with a margin of error of 10.
Construct a confidence interval for the mean score (out of 100 points) on the final exam.
ANSWER: 67, 87
QUESTION 21
Fill in the following contingency table and find the number of students who both do not play sports AND do not play an instrument.
StudentsplaysportsdonotplaysportsTotalplayaninstrument33d onotplayaninstrument69Total6267
ANSWSER: 30?
QUESTION 22
Suppose a chef claims that her meatball weight is less than 4 ounces, on average.
Several of her customers do not believe her, so the chef decides to do a hypothesis test, at a 10% significance level, to persuade them. She cooks 14 meatballs. The mean weight of the sample meatballs is 3.7 ounces. The chef knows from experience that the standard deviation for her meatball weight is 0.5 ounces.
• H0: μ≥4; Ha: μ<4
• α=0.1 (significance level)
What is the test statistic (z-score) of this one-mean hypothesis test, rounded to two decimal places?
ANSWER: -2.24
QUESTION 23
Which of the following frequency tables show a skewed data set? Select all answers that apply.
Select all that apply:
•
Value Frequency
5 1
6 2
7 10
8 11
9 17
10 17
11 15
12 12
13 7
14 7
15 0
16 1
•
•
Valu Frequen
e cy
5 1
6 3
7 8
8 10
9 13
10 26
11 14
12 12
13 8
14 3
15 1
16 1
•
•
Value Frequency
1
1
3
6
16 23
17 29
18 19
19 15
3
•
•
Value Frequency
5
5 9
6 4
7 2
QUESTION 24
A bar graph has a horizontal axis titled Values labeled from 2 to 18 in increments of 2 and a vertical axis titled Frequency labeled from 0 to 200 in increments of 50. 14 bars are plotted, above the numbers 2 to 16. From left to right, the heights of the bars are as follows: 1. 5. 10. 40, 75, 125, 190, 180, 130, 125, 60, 25,20, 10. All values are
approximate.
The data are skewed to the left.
The data are skewed to the right.
The data are symmetric.
QUESTION 25
Each person in a group shuffles a deck of cards and keeps selecting a card until a queen appears. Find the mode of the following number of cards drawn from a deck until a queen appears.
3,12,3,11,5,5,3,10,12
ANSWER: 3 CARDS
QUESTION 26
Ariana keeps track of the amount of time she studies and the score she gets on her quizzes. The data are shown in the table below. Which of the scatter plots below accurately records the data?
Hours studying Quiz score
1 5
2 5
3 7
4 9
5 9
A scatterplot has a horizontal axis labeled Hours studying from 0 to 6 in increments of 1 and a vertical axis labeled Quiz score from 0 to 10 in increments of 2. The following points are plotted: left-parenthesis 1 comma 5 right-parentheses; left-parenthesis 2
comma 5 right-parentheses; left-parenthesis 3 comma 7 right-parentheses; left- parenthesis 4 comma 9 right-parentheses; left-parenthesis 5 comma 9 right- parentheses. All values are approximate.
A scatterplot has a horizontal axis labeled Hours studying from 0 to 10 in increments of 2 and a vertical axis labeled Quiz score from 0 to 6 in increments of 1. The following points are plotted: left-parenthesis 5 comma 1 right-parentheses; left-parenthesis 5 comma 2 right-parentheses; left-parenthesis 7 comma 3 right-parentheses; left-
parenthesis 9 comma 4 right-parentheses; left-parenthesis 9 comma 5 right- parentheses. All values are approximate.
A scatterplot has a horizontal axis labeled Hours studying from 0 to 6 in increments of 1 and a vertical axis labeled Quiz score from 0 to 9 in increments of 1. The following points are plotted: left-parenthesis 1 comma 5 right-parentheses; left-parenthesis 2 comma 5 right-parentheses; left-parenthesis 3 comma 7 right-parentheses; left-
parenthesis 4 comma 8 right-parentheses; left-parenthesis 5 comma 8 right- parentheses.
QUESTION 27
As a member of a marketing team, you have been tasked with determining the number of DVDs that people have rented over the past six months. You sample twenty adults and decide that the best display of data is a frequency table for grouped data. Construct this table using four classes.
15,31,28,19,14,18,28,19,10,19,10,24,14,18,24,27,10,18,16,2
ANSWER:
Lower class limit. Upper class limit. frequency
10. 16. 7
17. 23. 7
24. 30. 5
31. 37 1
QUESTION 28
Which of the data sets represented by the following box and whisker plots has the smallest standard deviation?
Four horizontal box-and-whisker plots share a vertical axis with the classes D, C, B, and A and a horizontal axis from 0 to 120 in increments of 20. The box-and-whisker plot above the class label A has the following five-number summary: 44, 69, 77, 82, and 112.
The box-and-whisker plot above the class label B has the following five-number summary: 19, 64, 78, 87, and 121. The box-and-whisker plot above the class label C
has the following five-number summary: 60, 72, 75, 80, and 92. The box-and-whisker
plot above the class label D has the following five-number summary: 2, 63, 77, 92, and
138. All values are approximate.
A B C
D
QUESTION 29
A random sample of adults were asked whether they prefer reading an e-book over a printed book. The survey resulted in a sample proportion of p′=0.14, with a sampling standard deviation of σp′=0.02, who preferred reading an e-book.
Use the empirical rule to construct a 95% confidence interval for the true proportion of adults who prefer e-books.
ANSWER: 67, 87
QUESTION 30
The bar graph below shows the number of boys and girls in different classes.
A bar graph has a horizontal axis labeled Classes and a vertical axis labeled Students from 0 to 16 in increments of 2. There are two vertical bars above each horizontal axis label, with the bar on the left representing Boys and the bar on the right representing Girls. The bars have heights as follows, with the horizontal axis label listed first and the bar heights listed second from left to right: Mrs. Brown, 10 and 15; Ms. James, 11 and 12.
How many total students are in Ms. James's class? Do not include the units in your answer.
ANSWER: 23
QUESTION 31
Is the statement below true or false?
Independent is the property of two events in which the knowledge that one of the events occurred does not affect the chance the other occurs.
True
False
QUESTION 32
True or False: The more shoes a manufacturer makes, the more shoes they sell.
True False
QUESTION 33
An amateur astronomer is researching statistical properties of known stars using a variety of databases. They collect the color index, or B−V index, and distance (in light years) from Earth for 30 stars. The color index of a star is the difference in the light
absorption measured from the star using two different light filters (a B and a V filter).
This then allows the scientist to know the star's temperature and a negative value means a hot blue star. A light year is the distance light can travel in 1 year, which is approximately 5.9 trillion miles. The data is provided below. Use Excel to calculate the correlation coefficient r between the two data sets, rounding to two decimal places.
1.1
1380
ANSWER: R=0.18
QUESTION 34
0.4
556
1.0
771
0.5
304
1.4
532
1.0
751
0.5
267
0.8
229
0.5
552
HelpCopy to ClipboardDownload CSV
The histogram below displays the weights of rainbow trout (in pounds) caught by all visitors at a lake on a Saturday afternoon. According to this histogram, which range of weights (in pounds) contains the lowest frequency?
A histogram has a vertical axis labeled Frequency and has a horizontal axis that measures six categories of rainbow trout weight (in pounds). Reading from left-to-right, the weight and frequency of each category are: 4.5 to 6.5 has frequency of 4, 6.5 to 8.5 has frequency 5, 8.5 to 10.5 has frequency 7, 10.5 to 12.5 has frequency 3, 12.5 to 14.5
has frequency 1, 14.5 to 16.5 has frequency 2.
ANSWER: 12.5, 14.5
QUESTION 35
The line graph shown below represents the number of TVs in a house by square footage (in hundreds of feet). According to the information above, which of the following is an appropriate analysis of square footage and TVs?
A line graph has an x-axis labeled Square Footage (in hundreds of feet) in increments of one, and a y-axis labeled Number of TV's in increments of one. Beginning at the point start parentheses 6,2 end parentheses, a line increases to the point start parentheses 8.5,3 end parentheses. The line remains constant to the point start parentheses 10,3 end parentheses. The line then increases, passing through the point start parentheses 12,5 end parentheses and continues increasing until it reaches the point start parentheses 16,6 end parentheses.
From the data, the number of TVs doubled from a square footage of 8.5 and 10. From the data, there is a steady decrease in the square footage and number of TVs.
From the data, there is a steady increase in the square footage and number of TVs.
From the data, when the square footage is between 8.5 and 10, the number of TVs remains the same.
QUESTION 36
Given the plot of normal distributions A and B below, which of the following statements is true? Select all correct answers.
A normal bell curve labeled Upper A and a normal elongated curve labeled Upper B are centered at the same point. Normal curve Upper B is narrower and above normal curve Upper A.
• A has the larger mean.
• B has the larger mean.
• The means of A B
• A
• B has the larger standard deviation.
• The standard deviations of A and B are equal.
QUESTION 37
Describe the shape of the given histogram.
A histogram has a horizontal axis from 0 to 16 in increments of 2 and a vertical axis labeled Frequency from 0 to 10 in increments of 2. The histogram contains vertical bars of width 1 starting at the horizontal axis value 0. The heights of the bars are as follows, where the left horizontal axis label is listed first and the frequency is listed second: 0, 0; 1, 0; 2, 6; 3, 6; 4, 7; 5, 6; 6, 6; 7, 6; 8, 7; 9, 6; 10, 6; 11, 6; 12, 6; 13, 7; 14, 0; 15, 0.
uniform
unimodal and symmetric unimodal and left-skewed unimodal and right-skewed
bimodal
QUESTION 38
A farmer divided his piece of land into 4 equivalent groups. The quality of the soil is the same across the 4 groups of land. He planted the same crop in all 4 groups of
land and recorded the yield of the crop in all 4 groups for a 4 week period. Is the study observational or experimental? If it is an experiment, what is the controlled factor?
The study is an observational study.
The study is an experiment. The controlled factor is the 4 week observation period. The study is an experiment. The controlled factor is the land.
The study is an experiment. The controlled factor is the growth of the crops.
QUESTION 39
Becky's statistics teacher was teaching the class how to perform the z-test for a proportion. Becky was bored because she had already mastered the test, so she
decided to see if the coin she had in her pocket would come up heads or tails in a truly random fashion when flipped. She discretely flipped the coin 30 times and got
heads 18 times.
Becky conducts a one-proportion hypothesis test at the 5% significance level, to test whether the true proportion of heads is different from 50%.
Which answer choice shows the correct null and alternative hypotheses for this test?
H0:p=0.6; Ha:p>0.6, which is a right-tailed test. H0:p=0.5; Ha:p<0.5, which is a left-tailed test. H0:p=0.6; Ha:p≠0.6, which is a two-tailed test. H0:p=0.5; Ha:p≠0.5, which is a two-tailed test.
QUESTION 40
The graph below shows the graphs of several normal distributions, labeled A, B, and C, on the same axis. Determine which normal distribution has the smallest standard deviation.
A figure consists of three curves along a horizontal axis, labeled Upper A, Upper B and Upper C. Curve Upper A is short and the most spread out, curve Upper B is tall and the least spread out, and curve C is farther to the left than A.
A
B C
QUESTION 41
The following frequency table summarizes a set of data. What is the five-number summary?
Value Frequency
1 4
2 2
7 1
8 1
9 1
10 4
12 3
16 1
20 1
22 1
Min Q1 Median Q3 Max
1 2 10 12 22
Min Q1 Median Q3 Max
1 2 6 12 22
Min Q1 Median Q3 Max
1 4 5 10 22
Min Q1 Median Q3 Max
1 7 8 14 22
Min Q1 Median Q3 Max
1 3 14 14 22
QUESTION 42
The answer choices below represent different hypothesis tests. Which of the choices are right- tailed tests? Select all correct answers.
• H0:X≥17.1, Ha:X<17.1
•
• H0:X=14.4, Ha:X≠14.4
•
• H0:X≤3.8, Ha:X>3.8
•
• H0:X≤7.4, Ha:X>7.4
•
• H0:X=3.3, Ha:X≠3.3
QUESTION 43
True or false: The higher the average daily crops harvested, the closer to the peak of harvest it is.
True
False
QUESTION 44
•
1 POINT
The answer choices below represent different hypothesis tests. Which of the choices are left- tailed tests? Select all correct answers.
• H0:X=17.3, Ha:X≠17.3
•
• H0:X≥19.7, Ha:X<19.7
•
• H0:X≥11.2, Ha:X<11.2
•
• H0:X=13.2, Ha:X≠13.2
•
• H0:X=17.8, Ha:X≠17.8
QUESTION 45
Given the following list of prices (in thousands of dollars) of randomly selected trucks at a car dealership, find the median.
20,46,19,14,42,26,33
ANSWER: 26
QUESTION 46
What is the p-value of a right-tailed one-mean hypothesis test, with a test statistic
of z0=1.74? (Do not round your answer; compute your answer using a value from the table below.)
z1.51.61.71.81.90.000.9330.9450.9550.9640.9710.010.9340. 9460.9560.9650.9720.020.9360.9470.9570.9660.9730.030.9
370.9480.9580.9660.9730.040.9380.9490.9590.9670.9740.0
50.9390.9510.9600.9680.9740.060.9410.9520.9610.9690.97
50.070.9420.9530.9620.9690.9760.080.9430.9540.9620.970
0.9760.090.9440.9540.9630.9710.977
ANSWER: 0.041
QUESTION 47
Kenneth, a competitor in cup stacking, claims that his average stacking time is 8.2 seconds. During a practice session, Kenneth has a sample stacking time mean of 7.8 seconds based on 11 trials. At the 4% significance level, does the data provide sufficient evidence to conclude that Kenneth's mean stacking time is less than 8.2 seconds? Accept or reject the hypothesis given the sample data below.
• H0:μ=8.2 seconds; Ha:μ<8.2 seconds
• α=0.04 (significance level)
• z0=−1.75
• p=0.0401
Do not reject the null hypothesis because the p-value 0.0401 is greater than the significance level α=0.04.
Reject the null hypothesis because the p-value 0.0401 is greater than the significance level α=0.04.
Reject the null hypothesis because the value of z is negative. Reject the null hypothesis because |−1.75|>0.04.
Do not reject the null hypothesis because |−1.75|>0.04.
QUESTION 48
Find the Type II error given that the null hypothesis, H0, is: a building inspector claims that no more than 15% of structures in the county were built without permits.
The building inspector thinks that no more than 15% of the structures in the county were built without permits when, in fact, no more than 15% of the structures really were built without permits.
The building inspector thinks that more than 15% of the structures in the county were built without permits when, in fact, more than 15% of the structures really were built without permits.
The building inspector thinks that more than 15% of the structures in the county were built without permits when, in fact, at most 15% of the structures were built without permits.
The building inspector thinks that no more than 15% of the structures in the county were built without permits when, in fact, more than 15% of the structures were built without permits.
QUESTION 49
Data is collected on the relationship between time spent playing video games and time spent with family. The data is shown in the table and the line of best fit for the data
is y^=−0.27x+57.5. Assume the line of best fit is significant and there is a
strong linear relationship between the variables.
Video Games (Minutes) 306090120 Time with Family (Minute s) 50403525
According to the line of best fit, the predicted number of minutes spent with family for someone who spent 95 minutes playing video games is 31.85. Is it reasonable to
use this line of best fit to make the above prediction?
The estimate, a predicted time of 31.85 minutes, is unreliable but reasonable.
The estimate, a predicted time of 31.85 minutes, is both unreliable and unreasonable. The estimate, a predicted time of 31.85 minutes, is both reliable and reasonable.
The estimate, a predicted time of 31.85 minutes, is reliable but unreasonable.
QUESTION 50
Fill in the following contingency table and find the number of students who both go to the beach AND go to the mountains.
Students go to the beach do not go to the beach Total go to the mountains 48 do not go to the mountains 21 Total 3695
ANSWER: 10 [Show Less]