Question 1
Given that in a one-tail test you cannot reject Ho, can you reject Ho in a two-tail test at the same a?
Answer
Yes
No
Maybe
1 points

... [Show More]
Question 2
For a sample size of n = 100 and σ = 10, we want to test the hypothesis H0: μ = 100. The sample mean is 103. The test statistic is
Answer
1.645
1.960
3.000
0.300
1 points
Question 3
Which of the following is incorrect?
Answer
The level of significance is the probability of making a Type I error
Lowering both a and b at once will require higher sample size
The probability of rejecting a true null hypothesis increases as n increases
When Type I error increases, Type II error must decrease, ceteris paribus
1 points
Question 4
In hypothesis testing, Type I error is
Answer
Set at 5 percent
Smaller than or equal to 5 percent
The probability of rejecting H0 when H0 is true
The probability of rejecting H0 when H1 is true
1 points
Question 5
Given a normal distribution with σ = 3, we want to test the hypothesis H0: μ = 20. We find that the sample mean is 21. The test statistic is
Answer
1.000
1.645
1.960
Impossible to find without more information
1 points
Question 6
The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it. A trial sample of 25 employees shows that 16 are dissatisfied. For a right-tailed test, the test statistic would be
Answer
1.227
1.375
1.400
1.115
1 points
Question 7
A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the critical value to test whether the mean transaction time exceeds 60 seconds at a = .01.
Answer
2.947
2.602
2.583
2.333
1 points
Question 8
As you are crossing a field at the farm, your country cousin Jake assures you "Don't worry about that old bull coming toward us. He's harmless." As you consider Jake's hypothesis, what would be Type I error on your part?
Answer
You will soon feel the bull's horns
You will run away for no good reason
Jake will not have any more visits from you
1 points
Question 9
Last year, 10 percent of all teenagers purchased a new iPhone. This year, a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone. To test whether the percent has risen, the p-value is approximately
Answer
.0501
.0314
.0492
.0036
1 points
Question 10
Which statement about a is not correct?
Answer
It is the probability of committing a Type I error
It is the test's significance level
It is the probability of rejecting a true H0
It is equal to 1-b
Given that in a one-tail test you cannot reject Ho, can you reject Ho in a two-tail test at the same a?
Answer
Yes
No
Maybe
1 points
Question 2
For a sample size of n = 100 and σ = 10, we want to test the hypothesis H0: μ = 100. The sample mean is 103. The test statistic is
Answer
1.645
1.960
3.000
0.300
1 points
Question 3
Which of the following is incorrect?
Answer
The level of significance is the probability of making a Type I error
Lowering both a and b at once will require higher sample size
The probability of rejecting a true null hypothesis increases as n increases
When Type I error increases, Type II error must decrease, ceteris paribus
1 points
Question 4
In hypothesis testing, Type I error is
Answer
Set at 5 percent
Smaller than or equal to 5 percent
The probability of rejecting H0 when H0 is true
The probability of rejecting H0 when H1 is true
1 points
Question 5
Given a normal distribution with σ = 3, we want to test the hypothesis H0: μ = 20. We find that the sample mean is 21. The test statistic is
Answer
1.000
1.645
1.960
Impossible to find without more information
1 points
Question 6
The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it. A trial sample of 25 employees shows that 16 are dissatisfied. For a right-tailed test, the test statistic would be
Answer
1.227
1.375
1.400
1.115
1 points
Question 7
A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the critical value to test whether the mean transaction time exceeds 60 seconds at a = .01.
Answer
2.947
2.602
2.583
2.333
1 points
Question 8
As you are crossing a field at the farm, your country cousin Jake assures you "Don't worry about that old bull coming toward us. He's harmless." As you consider Jake's hypothesis, what would be Type I error on your part?
Answer
You will soon feel the bull's horns
You will run away for no good reason
Jake will not have any more visits from you
1 points
Question 9
Last year, 10 percent of all teenagers purchased a new iPhone. This year, a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone. To test whether the percent has risen, the p-value is approximately
Answer
.0501
.0314
.0492
.0036
1 points
Question 10
Which statement about a is not correct?
Answer
It is the probability of committing a Type I error
It is the test's significance level
It is the probability of rejecting a true H0
It is equal to 1-b [Show Less]