QUIZ 1
Question 1 of 20 1.0/ 1.0 Points
Which of the following statements are false regarding a boxplot?
A.The height of the box has no
... [Show More] significance.
B.Boxplots can be used to either describe a single variable in a data set or to compare two (or more) variables
C.The length of the box equals the range of the data.
D.The right and left of the box are the third and first quartiles
Answer Key: C
Question 2 of 20 1.0/ 1.0 Points
A histogram that has a single peak and looks approximately the same to the left and right of the peak is called:
A.balanced
B.symmetric
C.proportional
D.bimodal
Answer Key: B
Question 3 of 20 0.0/ 1.0 Points
Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately what percent of the observations are within two standard deviations of the mean?
A.95%
B.50%
C.68%
D.99.7%
Answer Key: A
Question 4 of 20 1.0/ 1.0 Points
A population includes:
A.only machines
B.only households
C.only people
D.all objects of interest in a particular study
Answer Key: D
Question 5 of 20 1.0/ 1.0 Points
The amount of time needed to run the Boston marathon is an example of which type of variable?
A.discrete
B.continuous
C.none of the above
D.qualitative
Answer Key: B
Question 6 of 20 1.0/ 1.0 Points
Researchers may gain insight into the characteristics of a population by examining a
A.sample of the population
B.replica
C.mathematical model describing the population
D.description of the population
Answer Key: A
Question 7 of 20 1.0/ 1.0 Points
If a variable has possible values –2, 6, and 17, then this variable is
A.both a continuous and a discrete variable
B.neither a continuous nor a discrete variable
C.a continuous variable
D.a discrete variable
Answer Key: D
Question 8 of 20 1.0/ 1.0 Points
The total frequency of the data whose ogive is shown below is approximately
A.12
B.90
C.18
D.34
Answer Key: D
Question 9 of 20 1.0/ 1.0 Points
Data that arise from counts are called:
A.counted data
B.discrete data
C.nominal data
D.continuous data
Answer Key: B
Question 10 of 20 1.0/ 1.0 Points
The length of the box in the boxplot portrays the
A.median
B.interquartile range
C.mean
D.range
Answer Key: B
Question 11 of 20 1.0/ 1.0 Points
Which measure of central location is meaningful when the data are categorical?
A.The range
B.The mean
C.The mode
D.The median
Answer Key: C
Question 12 of 20 1.0/ 1.0 Points
A scatter plot would be useful for
A.Showing the trend of sales, over time, of five different brands of blank DVDs
B.Showing the top selling brands of blank DVDs
C.Showing the relative number of sales of four different brands of blank DVDs
D.Showing the relationship between the sales of blank CDs and blank DVDs
Answer Key: D [Show Less]