DESCRIPTIVE
STATISTICS: TABULAR AND GRAPHICAL
PRESENTATIONS
MULTIPLE CHOICE QUESTIONS
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
Answer: 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
Answer: 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
Answer: b
4. Qualitative data can be graphically represented by using
a(n)
a. histogram
b. frequency
polygon
c. ogive
d. bar
graph
Answer: 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
Answer: d
6. 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
Answer: b
7. Fifteen percent of the students in a school of Business Administration
a. a line graph
b. only a bar graph
c. only a pie chart
d. both a bar graph and a pie chart
Answer: d
8. A
researcher is gathering data from four geographical areas designated:
South = 1; North = 2; East = 3; West
= 4. The designated geographical regions
represent
a. qualitative data
b. quantitative
data
c. label
data
d. either
quantitative or qualitative data
Answer: a
9. A situation in which conclusions based
upon aggregated crosstablulation are different from unaggregated
crosstabulation is known as
a. wrong
crosstabulation
b. Simpson’s
rule
c. Simpson’s
paradox
d. aggregated
crosstabulation
Answer: c
10. A
cumulative relative frequency distribution shows
a. the
proportion of data items with values less than or equal to the upper limit of
each class
b. the
proportion of data items with values less than or equal to the lower limit of
each class
c. the
percentage of data items with values less than or equal to the upper limit of
each class
d. the
percentage of data items with values less than or equal to the lower limit of
each class
Answer: a
11. If
several frequency distributions are constructed from the same data set, the
distribution with the widest class width will have the
a. fewest classes
b. most classes
c. same
number of classes as the other distributions since all are constructed from the
same data
Answer: a
12. The
sum of the relative frequencies for all classes will always equal
a. the sample size
b. the number of classes
c. one
d. any value larger than one
Answer: c
13. The
sum of the percent frequencies for all classes will always equal
a. one
b. the
number of classes
c. the
number of items in the study
d. 100
Answer: d
14. The
most common graphical presentation of quantitative data is a
a. histogram
b. bar graph
c. relative frequency
d. pie chart
Answer: a
15. In
constructing a frequency distribution, the approximate class width is computed
as
a. (largest
data value – smallest data value)/number of classes
b. (largest
data value – smallest data value)/sample size
c. (smallest
data value – largest data value)/sample size
d. largest
data value/number of classes
Answer: a
16. In
constructing a frequency distribution, as the number of classes are decreased,
the class width
a. decreases
b. remains
unchanged
c. increases
d. can
increase or decrease depending on the data values
Answer: c
17. The difference between the lower class
limits of adjacent classes provides the
a. number
of classes
b. class
limits
c. class
midpoint
d. class
width
Answer: d
18. In a cumulative frequency distribution,
the last class will always have a cumulative frequency equal to
a. one
b. 100%
c. the
total number of elements in the data set
Answer: c
19. In a cumulative relative frequency
distribution, the last class will have a cumulative relative frequency equal to
a. one
b. zero
c. the
total number of elements in the data set
Answer: a
20. In
a cumulative percent frequency distribution, the last class will have a
cumulative percent frequency equal to
a. one
b. 100
c. the
total number of elements in the data set
Answer: b
21. Data
that provide labels or names for categories of like items are known as
a. qualitative data
b. quantitative data
c. label data
d. category data
Answer: a
22. A
tabular method that can be used to summarize the data on two variables
simultaneously is called
a. simultaneous
equations
b. crosstabulation
c. a
histogram
d. an
ogive
Answer: b
23. A
graphical presentation of the relationship between two variables is
a. an
ogive
b. a
histogram
c. either
an ogive or a histogram, depending on the type of data
d. a
scatter diagram
Answer: d
24. A histogram is said to be skewed to the
left if it has a
a. longer tail to the right
b. shorter tail to the right
c. shorter tail to the left
d. longer tail to the left
Answer: d
25. When a histogram has a longer tail to the
right, it is said to be
a. symmetrical
b. skewed to the left
c. skewed to the right
d. none of these alternatives is correct
Answer: c
26. In a scatter diagram, a line
that provides an approximation of the relationship between the variables is
known as
a. approximation line
b. trend line
c. line of zero intercept
d. line of zero slope
Answer: b
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