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This module is a quiz containing 10 multiple choice questions covering topics related to descriptive statistics. This module is part of a set of companion resources to Collaborative Statistics (col10522) by Barbara Illowsky and Susan Dean.

The following table shows the lengths of 64 international phone calls using a $5 prepaid calling card.

Frequency of phone call lengths
Data (minutes) Frequency Relative Frequency Cumulative Relative Frequency
4 25 0.3906
14 15
24 10 0.1563
34 9 0.1406
44 4 0.0625
54 1 0.0156 1.0000

Using the data, determine which ONE of the answers is correct:

  • A

    The mean and the median are equal.
  • B

    The mean is smaller than the median.
  • C

    The mean is larger than the median.
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Interpret the following box plot:

Which of the following is correct?

  • A

    75% of the data are at most 5.
  • B

    There is about the same amount of data from 2-5 as there is from 5-7.
  • C

    There are no data values of 3.
  • D

    50% of the data are 4.
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In a set of data, if all of the data appear with the same frequency, then:

  • A

    The standard deviation is always 0.
  • B

    The mean is always larger than the standard deviation.
  • C

    All of the data have the same value.
  • D

    The boxplot does not always look symmetrical.
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The following table shows the lengths of 64 international phone calls using a $5 prepaid calling card.

Frequency of phone call lengths
Data (minutes) Frequency Relative Frequency Cumulative Relative Frequency
4 25 0.3906
14 15
24 10 0.1563
34 9 0.1406
44 4 0.0625
54 1 0.0156 1.0000

Find the 60th percentile.

  • A

    14
  • B

    60
  • C

    15
  • D

    0.2344
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Consider the following data set:

  • 4
  • 6
  • 6
  • 12
  • 18
  • 18
  • 18
  • 200

What value is 2 standard deviations above the mean?

  • A

    There is not enough information
  • B

    Approximately -98
  • C

    Approximately 102
  • D

    Approximately 169
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Consider the following data:

  • 14
  • 16
  • 16
  • 22
  • 25
  • 38
  • 38
  • 38
  • 38
  • 2000

Which of the measures of central tendency would be the least useful?

  • A

    mean
  • B

    mode
  • C

    median
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The following table shows the lengths of 64 international phone calls using a $5 prepaid calling card.

Frequency of phone call lengths
Data (minutes) Frequency Relative Frequency Cumulative Relative Frequency
4 25 0.3906
14 15
24 10 0.1563
34 9 0.1406
44 4 0.0625
54 1 0.0156 1.0000

What percent of the data is either 34 or 44 minutes?

  • A

    Approximately 78%
  • B

    Approximately 13%
  • C

    Approximately 98%
  • D

    Approximately 20%
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Questions 8 – 10 refer to the following:

Sixty-four faculty members were asked the number of cars they owned (including spouse's and children's cars). The results are given in the histogram below:

The number of responses that were either "1" or "3" is approximately:

  • A

    0.4
  • B

    27
  • C

    40
  • D

    2
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Which of the following DOES NOT describe the data?

  • A

    there are approximately 10 faculy members that own 7 cars
  • B

    skewed left
  • C

    There are no values of 5
  • D

    skewed right
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The third quartile is:

  • A

    1
  • B

    2
  • C

    3
  • D

    0.75
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Source:  OpenStax, Collaborative statistics: supplemental course materials. OpenStax CNX. Oct 01, 2008 Download for free at http://legacy.cnx.org/content/col10586/1.2
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