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414 13 • Review Questions
b. You scored in the top 15% of all students taking the test.
c. Your score on the test is 85 when measured on a scale from 0 to 100.
d. You scored in the bottom 15% of all students taking the test.
7. The interquartile range is ________.
a. the middle 50% of a data set
b. the upper 50% of a data set
c. the lower 50% of a data set
d. equal to the median
8. In a frequency distribution table, the sum of the relative frequencies must be equal to ________.
a. the sample size
b. 1, or 100%
c. zero
d. the standard deviation of the distribution
9. A change in the standard deviation of a normal distribution will result in ________.
a. a change in the location of the peak of the curve
b. a change in the area under the curve
c. a change in the shape of the curve
d. a change that shifts the graph to the left or the right
10. When calculating an expected value, ________.
a. the result should always be 1
b. the result should always be a positive value
c. the result should always be a negative value
d. the result can be a positive or negative value
11. The area under a normal curve between a z-score of -2 and a z-score of +2 is ________.
a. 0.68
b. 0.95
c. 0.997
d. dependent on the mean and standard deviation
12. A scatter plot is a visualization for ________.
a. univariate data only
b. bivariate data only
c. either univariate or bivariate data
d. test scores
13. Which of the following is NOT a benefit of using the R statistical analysis tool?
a. Additional features are constantly being added by the user community.
b. It can be used on many computer platforms, including Mac, Windows, and Linux.
c. It is free to download.
d. Users pay an annual subscriiption fee.
Review Questions
1. Explain the considerations that determine whether the mean or the median is th
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