Question 1

An important numerical measure of the shape of a distribution is the

Accepted Answer

A)   5-number summary
B)   z-score.
C)   coefficient of variation.
D)   skewness.E) A) and C)
F) A) and D)

Question 2

​The most frequently occurring value of a data set is called the

Accepted Answer

A)   ​mean.
B)   ​median.
C)   ​mode.
D)   ​outlier.E) A) and B)
F) A) and C)

Question 3

The standard deviation of a sample of 81 observations equals 49. The variance of the sample equals

Accepted Answer

A)   7.
B)   9.
C)   2401.
D)   6561.E) B) and D)
F) B) and C)

Question 4

The variance of the sample

Accepted Answer

A)   cannot be negative.
B)   cannot be positive.
C)   cannot be zero.
D)   cannot be less than one.E) B) and C)
F) A) and D)

Question 5

The value of the sum of the deviations from the mean, i.e.,  must always be

Accepted Answer

A)   less than the zero.
B)   negative.
C)   either positive or negative depending on whether the mean is negative or positive.
D)   zero.E) A) and B)
F) C) and D)

Question 6

Which of the following symbols represents the mean of the population?

Accepted Answer

A)   σ2
B)   σ
C)   μ
D)   2 
B)   σ 
C)   μ 
D)    " class="answers-bank-image d-inline" rel="preload" >E) B) and C)
F) None of the above

Question 7

​The __________ can be interpreted as the number of standard deviations a data value is from the mean of all the data values.

Accepted Answer

A)   ​skewness
B)   ​coefficient of variation
C)   ​z-score
D)   ​correlation coefficientE) B) and D)
F) All of the above

Question 8

The closing stock price of MNM Corporation for the last 7 trading days is shown below.  ​ The mode is

Accepted Answer

A)   24.
B)   25.
C)   26.
D)   27.E) All of the above
F) A) and B)

Question 9

The weights (in pounds)  of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160
Range = 60
Mode = 165
Variance = 324
Median = 170
The coefficient of variation equals

Accepted Answer

A)   0.1125%.
B)   11.25%.
C)   203.12%.
D)   0.20312%.E) All of the above
F) B) and C)

Question 10

A researcher has collected the following sample data. The mean of the sample is 5.  The standard deviation is

Accepted Answer

A)   1.10.
B)   1.2.
C)   1.22.
D)   1.5.E) B) and C)
F) C) and D)

Question 11

The variance of a sample of 144 observations equals 576. The standard deviation of the sample equals

Accepted Answer

A)   12.
B)   21.
C)   441.
D)   63,504.E) None of the above
F) A) and B)

Question 12

Which of the following symbols represents the size of the population?

Accepted Answer

A)   σ2
B)   σ
C)   μ
D)   NE) C) and D)
F) A) and D)

Question 13

Positive values of covariance indicate

Accepted Answer

A)   a positive variance of the x values.
B)   a positive variance of the y values.
C)   the standard deviation is positive.
D)   positive relation between the independent and the dependent variables.E) C) and D)
F) B) and C)

Question 14

The symbol σ2 is used to represent the

Accepted Answer

A)   variance of the population.
B)   standard deviation of the sample.
C)   standard deviation of the population.
D)   variance of the sample.E) B) and C)
F) A) and D)

Question 15

A researcher has collected the following sample data.  The 75th percentile is

Accepted Answer

A)   13.
B)   14.
C)   15.
D)   16.E) None of the above
F) All of the above

Question 16

Which of the following descriptive statistics is not measured in the same units as the data?

Accepted Answer

A)   Mean
B)   Standard deviation
C)   Variance
D)   Interquartile rangeE) A) and B)
F) All of the above

Question 17

The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway.  The standard deviation is

Accepted Answer

A)   9.06.
B)   9.28.
C)   86.19.
D)   82.09.E) None of the above
F) All of the above

Question 18

The 50th percentile is the

Accepted Answer

A)   mode.
B)   median.
C)   mean.
D)   midrange.E) A) and B)
F) B) and D)

Question 19

The standard deviation of a sample was reported to be 20. The report indicated that  = 7200. What is the sample size?

Accepted Answer

A)   16
B)   17
C)   18
D)   19E) None of the above
F) A) and B)

Question 20

A researcher has collected the following sample data. The mean of the sample is 5. 13
15
12
13
12
The interquartile range is

Accepted Answer

A)   2.
B)   13.
C)   3.
D)   12.E) All of the above
F) A) and B)

Exam 3: Descriptive Statistics: Numerical Measures

A researcher has collected the following sample data. The 75th percentile is

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Which of the following descriptive statistics is not measured in the same units as the data?

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The 50th percentile is the

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Positive values of covariance indicate

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The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway. The standard deviation is

Correct AnswerverifiedShow Answer

A researcher has collected the following sample data. The mean of the sample is 5. The standard deviation is

Correct AnswerverifiedShow Answer

The standard deviation of a sample was reported to be 20. The report indicated that = 7200. What is the sample size?

Correct AnswerverifiedShow Answer

​The most frequently occurring value of a data set is called the

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Which of the following symbols represents the size of the population?

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A researcher has collected the following sample data. The mean of the sample is 5. 13 15 12 13 12 The interquartile range is

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Which of the following symbols represents the mean of the population?

Correct AnswerverifiedShow Answer

The variance of a sample of 144 observations equals 576. The standard deviation of the sample equals

Correct AnswerverifiedShow Answer

An important numerical measure of the shape of a distribution is the

Correct AnswerverifiedShow Answer

The value of the sum of the deviations from the mean, i.e., must always be

Correct AnswerverifiedShow Answer

The variance of the sample

Correct AnswerverifiedShow Answer

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 Range = 60 Mode = 165 Variance = 324 Median = 170 The coefficient of variation equals

Correct AnswerverifiedShow Answer

​The __________ can be interpreted as the number of standard deviations a data value is from the mean of all the data values.

Correct AnswerverifiedShow Answer

The standard deviation of a sample of 81 observations equals 49. The variance of the sample equals

Correct AnswerverifiedShow Answer

The symbol σ2 is used to represent the

Correct AnswerverifiedShow Answer

The closing stock price of MNM Corporation for the last 7 trading days is shown below. ​ The mode is

Correct AnswerverifiedShow Answer

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The most frequently occurring value of a data set is called the

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The __________ can be interpreted as the number of standard deviations a data value is from the mean of all the data values.

Correct Answer
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The symbol σ² is used to represent the

Correct Answer
verified

The closing stock price of MNM Corporation for the last 7 trading days is shown below. The mode is

Correct Answer
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