Question 1

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

Accepted Answer

A)  σ2 
B)  σ 
C)  μ 
D)    
A)  σ2 
B)  σ 
C)  μ 
D)    A

Question 2

Since the mode is the most frequently occurring data value, it

Accepted Answer

A)  can never be larger than the mean. 
B)  is always larger than the median. 
C)  is always larger than the mean. 
D)  none of these alternatives is correct. 
A)  can never be larger than the mean. 
B)  is always larger than the median. 
C)  is always larger than the mean. 
D)  none of these alternatives is correct. D

Question 3

The following frequency distribution shows the GMAT scores of a sample of MBA students:   ​
For the above data, compute the mean GMAT score.

Accepted Answer

545

Question 4

The pth percentile is a value such that approximately

Accepted Answer

A)  p percent of the observations are less than the value and (100 - p) percent are more than this value. 
B)  p percent of the observations are less than the value and p percent are more than this value. 
C)  (100 - p) percent of the observations are less than the value and p percent are more than this value. 
D)  (100 - p) percent of the observations are less than the value and (100 - p) percent are more than this value. 
A)  p percent of the observations are less than the value and (100 - p) percent are more than this value. 
B)  p percent of the observations are less than the value and p percent are more than this value. 
C)  (100 - p) percent of the observations are less than the value and p percent are more than this value. 
D)  (100 - p) percent of the observations are less than the value and (100 - p) percent are more than this value.

Question 5

Last semester grades of Michael, a freshman at a local college are shown below.
​   ​
The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0.Compute Michael's semester grade point average.

Accepted Answer

The answer of Last semester grades of Michael, a freshman...

Question 6

In 2012, the average donation to the Community Kitchen was $900 with a standard deviation of $180.In 2013, the average donation was $1,600 with a standard deviation of $240.In which year do the donations show a more dispersed distribution?

Accepted Answer

The coefficient of variation i

Question 7

​For data skewed to the left, the skewness is

Accepted Answer

A)  ​less than .5. 
B)  ​less than 1. 
C)  ​less than the mean. 
D)  ​negative. 
A)  ​less than .5. 
B)  ​less than 1. 
C)  ​less than the mean. 
D)  ​negative.

Question 8

The geometric mean of 1, 1, 8 is

Accepted Answer

A)  10.0. 
B)  2.0. 
C)  3.33. 
D)  3.16. 
A)  10.0. 
B)  2.0. 
C)  3.33. 
D)  3.16.

Question 9

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

Accepted Answer

A)  9. 
B)  77. 
C)  65. 
D)  67. 
A)  9. 
B)  77. 
C)  65. 
D)  67.

Question 10

​A box plot is a graphical representation of data that is based on

Accepted Answer

A)  ​the empirical rule. 
B)  ​z-scores. 
C)  ​a histogram. 
D)  ​a five number summary. 
A)  ​the empirical rule. 
B)  ​z-scores. 
C)  ​a histogram. 
D)  ​a five number summary.

Question 11

The descriptive measure of variability that is based on the concept of a variation about the mean is the

Accepted Answer

A)  range. 
B)  interquartile range. 
C)  absolute value of the range. 
D)  standard deviation. 
A)  range. 
B)  interquartile range. 
C)  absolute value of the range. 
D)  standard deviation.

Question 12

Which of the following is a measure of variability?

Accepted Answer

A)  Percentiles 
B)  Quartiles 
C)  Interquartile range 
D)  Midrange 
A)  Percentiles 
B)  Quartiles 
C)  Interquartile range 
D)  Midrange

Question 13

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Accepted Answer

A)  As much as possible since computations are easier 
B)  Only when individual data values are unavailable 
C)  Whenever computer packages for descriptive statistics are unavailable 
D)  Only when the data are from a population 
A)  As much as possible since computations are easier 
B)  Only when individual data values are unavailable 
C)  Whenever computer packages for descriptive statistics are unavailable 
D)  Only when the data are from a population

Question 14

Which of the following symbols represents the standard deviation of the population?

Accepted Answer

A)  σ2 
B)  σ 
C)  μ 
D)    
A)  σ2 
B)  σ 
C)  μ 
D)

Question 15

The relative frequency of a class is computed by dividing the

Accepted Answer

A)  midpoint of the class by the sample size. 
B)  frequency of the class by the midpoint. 
C)  sample size by the frequency of the class. 
D)  frequency of the class by the sample size. 
A)  midpoint of the class by the sample size. 
B)  frequency of the class by the midpoint. 
C)  sample size by the frequency of the class. 
D)  frequency of the class by the sample size.

Question 16

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

Accepted Answer

A)  σ2 
B)  σ 
C)  μ 
D)    
A)  σ2 
B)  σ 
C)  μ 
D)

Question 17

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

Accepted Answer

A)  σ2 
B)  σ 
C)  μ 
D)  N 
A)  σ2 
B)  σ 
C)  μ 
D)  N

Question 18

μ is an example of a

Accepted Answer

A)  population parameter. 
B)  sample statistic. 
C)  population variance. 
D)  sample mean. 
A)  population parameter. 
B)  sample statistic. 
C)  population variance. 
D)  sample mean.

Question 19

Which of the following is not a measure of variability of a single variable?​

Accepted Answer

A)  Range 
B)  ​Covariance 
C)  ​Standard deviation 
D)  ​Interquartile range 
A)  Range 
B)  ​Covariance 
C)  ​Standard deviation 
D)  ​Interquartile range

Question 20

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. 
A)  7. 
B)  9. 
C)  2401. 
D)  6561.

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

Since the mode is the most frequently occurring data value, it

The following frequency distribution shows the GMAT scores of a sample of MBA students: For the above data, compute the mean GMAT score.

The pth percentile is a value such that approximately

Last semester grades of Michael, a freshman at a local college are shown below. The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0.Compute Michael's semester grade point average.

In 2012, the average donation to the Community Kitchen was $900 with a standard deviation of $180.In 2013, the average donation was $1,600 with a standard deviation of $240.In which year do the donations show a more dispersed distribution?

For data skewed to the left, the skewness is

The geometric mean of 1, 1, 8 is

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

A box plot is a graphical representation of data that is based on

The descriptive measure of variability that is based on the concept of a variation about the mean is the

Which of the following is a measure of variability?

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Which of the following symbols represents the standard deviation of the population?

The relative frequency of a class is computed by dividing the

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

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

μ is an example of a

Which of the following is not a measure of variability of a single variable?

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

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Filters

Exam 3: Descriptive Statistics: Numerical Measures

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

Since the mode is the most frequently occurring data value, it

The following frequency distribution shows the GMAT scores of a sample of MBA students: ​ For the above data, compute the mean GMAT score.

The pth percentile is a value such that approximately

Last semester grades of Michael, a freshman at a local college are shown below. ​ ​ The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0.Compute Michael's semester grade point average.

In 2012, the average donation to the Community Kitchen was $900 with a standard deviation of $180.In 2013, the average donation was $1,600 with a standard deviation of $240.In which year do the donations show a more dispersed distribution?

​For data skewed to the left, the skewness is

The geometric mean of 1, 1, 8 is

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

​A box plot is a graphical representation of data that is based on

The descriptive measure of variability that is based on the concept of a variation about the mean is the

Which of the following is a measure of variability?

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Which of the following symbols represents the standard deviation of the population?

The relative frequency of a class is computed by dividing the

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

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

μ is an example of a

Which of the following is not a measure of variability of a single variable?​

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

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Filters

The following frequency distribution shows the GMAT scores of a sample of MBA students: For the above data, compute the mean GMAT score.

Last semester grades of Michael, a freshman at a local college are shown below. The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0.Compute Michael's semester grade point average.

For data skewed to the left, the skewness is

A box plot is a graphical representation of data that is based on

Which of the following is not a measure of variability of a single variable?