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Practice Quiz
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1
In a frequency distribution the categories must
A)Be mutually exclusive.
B)Have at least 5 observations.
C)Be of the same size.
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
The class frequency
A)Is the number of observations in each class.
B)Is the difference between consecutive lower class limits.
C)Always contains at least 5 observations.
D)Is usually a multiple of the lower limit of the first class.
4
A research organization is making a study of the selling price of home computers. There are 45 computers in the study. How many classes would you recommend?
A)10
B)20
C)6
D)3
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
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)Multiply the class frequency by 100.
7
For a stem-and-leaf display
A)Arrange the leaf values from smallest to largest.
B)Make sure the stem value is only one digit.
C)Do not allow stems with no leaf values.
D)All of the above.
8
The difference between a histogram and a frequency polygon is
A)The frequency polygon is reported as a percent.
B)The histogram employs bars whereas the midpoints are connected for a frequency polygon.
C)Bars cannot be adjacent in a histogram.
D)Open-ended classes can be accommodated with a frequency polygon.
9
In a less-than cumulative frequency distribution
A)The class frequencies are converted to a percent.
B)There must be at least 5 observations in each class.
C)We add the class frequencies starting with the first class.
D)All of the above.
10
For the following questions, 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.
11
For the following questions, refer to the following information on the number of units assembled per shift at Acme Assembly, Inc.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>
The frequency for the third class is
A)200.
B)51.
C)10.
D)None of the above.
12
For the following questions, refer to the following information on the number of units assembled per shift at Acme Assembly, Inc.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>
What is the midpoint of the 20 up to 30 class?
A)24.5
B)25
C)16
D)None of the above.
13
For the following questions, refer to the following information on the number of units assembled per shift at Acme Assembly, Inc.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>
The lower limit of the second class is
A)29.9999.
B)30.
C)25.
D)None of the above.
14
The following questions refer to the following information. It reports the number of TV sets per day at the Appliance Center.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image2.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>
The arrangement is called a
A)Frequency distribution.
B)Frequency polygon.
C)Pie chart.
D)Stem-and-leaf chart.
15
The following questions refer to the following information. It reports the number of TV sets per day at the Appliance Center.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image2.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>
How many days were studied?
A)11
B)30
C)50
D)None of the above.
16
The following questions refer to the following information. It reports the number of TV sets per day at the Appliance Center.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image2.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>
What was the smallest and largest number of sets sold per day?
A)1, 8
B)10, 80
C)11, 88
D)None of the above.
17
The following questions refer to the following information. It reports the number of TV sets per day at the Appliance Center.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image2.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>
On how many days were fewer than 30 sets sold?
A)15
B)6
C)30
D)None of the above.
18
The following questions refer to the following information. It reports the number of TV sets per day at the Appliance Center.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070951640/354829/ch2image2.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>
The actual number of sets sold per day between 60 and 69 is
A)65, 66, 67, 68, 68.
B)60, 69.
C)Cannot tell from the information given.
D)None of the above.
19
The difference between a histogram and a bar chart is:
A)The midpoints are connected with a histogram but not with a bar chart.
B)The bars must be next to each other on a histogram and separated in a bar chart.
C)Cumulative frequencies are required in a bar chart.
D)None of the above.
20
An ogive is a
A)Relative frequency distribution
B)Histogram
C)Cumulative bar chart
D)Cumulative frequency polygon
21
The leaves in a stem-and-leaf display are
A)Leading digits
B)Equal in number
C)Trailing digits
D)Clustered near the end points
22
To show the change in a variable over time, it is best to use
A)Histogram
B)Cumulative frequency polygon
C)Pie chart
D)Line chart





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