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1
In a frequency distribution the categories must
A)Be mutually exclusive.
B)Have a maximum of 10 observations.
C)Be of the same frequency.
D)Be of nominal scale.
2
To determine the class interval
A)Divide the class frequencies in half.
B)Divide the class frequency by the number of observations.
C)Find the difference between consecutive lower class limits.
D)Count the number of observations in the class.
3
A class frequency is described as
A)The number of observations in each class.
B)The difference between consecutive lower class limits.
C)Containing a maximum of 10 observations.
D)The total number of observations in the sample.
4
A research organization is studying the selling price of laptop computers. There are 25 computers in the study. How many classes would you recommend?
A)10
B)25
C)4
D)5
5
To find the class midpoint,
A)Divide the class interval in half and add the result to the lower limit.
B)Find the difference between consecutive lower limits.
C)Count the number of observations in the class.
D)Divide the class frequency by the number of observations.
6
Which of the following is not a guideline for a frequency distribution?
A)Avoid open-ended classes.
B)Use the 2k rule to determine the number of classes.
C)Make the lower limit of the first class a multiple of the class interval.
D)Have more than 5 observations in each class.
7
To convert a frequency distribution to a relative frequency distribution
A)Find the difference between consecutive lower class limits.
B)Divide the class frequency by the total number of observations.
C)Divide the lower limit of the first class by the class interval.
D)Multiple the class frequency by 100.
8
A pie chart shows the
A)Frequency in each class.
B)Proportion in each class.
C)Trends in the data.
D)Class intervals.
9
The difference between a histogram and a frequency polygon is
A)The frequency polygon is reported as a percent, a histogram does not reported percents.
B)The histogram shows frequencies while a frequency polygon shows cumulative frequencies.
C)The bars in a histogram and a frequency polygon cannot be adjacent.
D)Open-ended classes can be accommodated with a frequency polygon.
10
In a cumulative frequency polygon
A)The class frequencies are converted to a percent.
B)There can be any number of observations.
C)We add the class frequencies starting with the first class.
D)All of the above.
11

For questions 11- 12 refer to the following information on the number of units assembled per shift at Acme Assembly, Inc.

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The class interval is:
A)10
B)25
C)9
D)None of the above.
12
The frequency for the third class is
A)200
B)51
C)10
D)None of the above.
13
In a frequency table
A)the classes must be mutually exclusive.
B)the data is quantitative.
C)the should be at least 100 observations in the sample.
D)All of the above are correct.
14
A pie chart is used when we wish to emphasize
A)The number of observations in each category.
B)The percent of observations in each category.
C)The level of measurement of the observations.
D)All of the above.





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