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CHAPTER 2—DESCRIPTIVE STATISTICS: TABULAR AND GRAPHICAL
PRESENTATIONS
MULTIPLE CHOICE
1. A frequency distribution is a tabular summary of data showing the
a. fraction of items in several classes
b. percentage of items in several classes
c. relative percentage of items in several classes
d. number of items in several classes
ANS: D
2. A frequency distribution is
a. a tabular summary of a set of data showing the relative frequency
b. a graphical form of representing data
c. a tabular summary of a set of data showing the frequency of items in each of several
nonoverlapping classes
d. a graphical device for presenting qualitative data
ANS: C
3. A tabular summary of a set of data showing the fraction of the total number of items in several classes
is a
a. frequency distribution
b. relative frequency distribution
c. frequency
d. cumulative frequency distribution
ANS: B
4. Qualitative data can be graphically represented by using a(n)
a. histogram
b. frequency polygon
c. ogive
d. bar graph
ANS: D
5. The relative frequency of a class is computed by
a. dividing the midpoint of the class by the sample size
b. dividing the frequency of the class by the midpoint
c. dividing the sample size by the frequency of the class
d. dividing the frequency of the class by the sample size
ANS: D
6. The percent frequency of a class is computed by
a. multiplying the relative frequency by 10
b. dividing the relative frequency by 100
c. multiplying the relative frequency by 100
d. adding 100 to the relative frequency
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ANS: C
7. The sum of frequencies for all classes will always equal
a. 1
b. the number of elements in a data set
c.
the number of classes
d. a value between 0 and 1
ANS: B
8. Fifteen percent