Question 1

Geometric mean is a measure of

Accepted Answer

A)  location. 
B)  dispersion. 
C)  variability. 
D)  weight. 
A)  location. 
B)  dispersion. 
C)  variability. 
D)  weight.

Question 2

The coefficient of variation is the

Accepted Answer

A)  same as the variance. 
B)  standard deviation divided by the mean times 100. 
C)  square of the standard deviation. 
D)  mean divided by the standard deviation. 
A)  same as the variance. 
B)  standard deviation divided by the mean times 100. 
C)  square of the standard deviation. 
D)  mean divided by the standard deviation.

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

The answer of The following frequency distribution shows the GMAT...

Question 4

Which of the following is not a measure of variability?

Accepted Answer

A)  Midrange 
B)  Standard deviation 
C)  Range 
D)  Interquartile range 
A)  Midrange 
B)  Standard deviation 
C)  Range 
D)  Interquartile range

Question 5

When data are positively skewed, the mean will usually be

Accepted Answer

A)  greater than the median. 
B)  smaller than the median. 
C)  equal to the median. 
D)  positive. 
A)  greater than the median. 
B)  smaller than the median. 
C)  equal to the median. 
D)  positive.

Question 6

A numerical value used as a summary measure for a sample is known as a sample

Accepted Answer

A)  error. 
B)  parameter. 
C)  statistic. 
D)  value. 
A)  error. 
B)  parameter. 
C)  statistic. 
D)  value.

Question 7

The average wage of Tennessee cashiers is $14 per hour with a standard deviation of $4.20.In Georgia, the average wage of cashiers is $16 with a standard deviation of $4.40.In which state do the wages of cashiers appear to be more dispersed?

Accepted Answer

The coefficient of variation i

Question 8

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

Question 9

A numerical measure of linear association between two variables is the

Accepted Answer

A)  variance. 
B)  covariance. 
C)  standard deviation. 
D)  coefficient of variation. 
A)  variance. 
B)  covariance. 
C)  standard deviation. 
D)  coefficient of variation.

Question 10

The value which has half of the observations above it and half the observations below it is called the

Accepted Answer

A)  midrange. 
B)  median. 
C)  mean. 
D)  mode. 
A)  midrange. 
B)  median. 
C)  mean. 
D)  mode.

Question 11

The mean of the sample

Accepted Answer

A)  is always smaller than the mean of the population from which the sample was taken. 
B)  can never be zero. 
C)  can never be negative. 
D)  can assume any value between the highest and the lowest value in the sample. 
A)  is always smaller than the mean of the population from which the sample was taken. 
B)  can never be zero. 
C)  can never be negative. 
D)  can assume any value between the highest and the lowest value in the sample.

Question 12

Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?

Accepted Answer

A)  Mean 
B)  Median 
C)  Mode 
D)  Midrange 
A)  Mean 
B)  Median 
C)  Mode 
D)  Midrange

Question 13

The coefficient of variation indicates how large the standard deviation is relative to the​

Accepted Answer

A)  ​mean. 
B)  ​median. 
C)  ​range. 
D)  ​variance. 
A)  ​mean. 
B)  ​median. 
C)  ​range. 
D)  ​variance.

Question 14

​In computing descriptive statistics for grouped data, the data values in each class are approximated using the

Accepted Answer

A)  ​class lower limits. 
B)  ​class upper limits. 
C)  ​class midpoint. 
D)  ​class range. 
A)  ​class lower limits. 
B)  ​class upper limits. 
C)  ​class midpoint. 
D)  ​class range.

Question 15

The variance of a sample was reported to be 144.The report indicated that   = 7200.What is the sample size?

Accepted Answer

A)  49 
B)  50 
C)  51 
D)  52 
A)  49 
B)  50 
C)  51 
D)  52

Question 16

The first quartile is the same as the

Accepted Answer

A)  median. 
B)  25th percentile. 
C)  50th percentile. 
D)  75th percentile. 
A)  median. 
B)  25th percentile. 
C)  50th percentile. 
D)  75th percentile.

Question 17

When computing the mean, the smallest value

Accepted Answer

A)  can never be negative. 
B)  can never be zero. 
C)  can never be less than the mean. 
D)  can be any value. 
A)  can never be negative. 
B)  can never be zero. 
C)  can never be less than the mean. 
D)  can be any value.

Question 18

When n - 1 is used in the denominator to compute variance, the data set

Accepted Answer

A)  is a sample. 
B)  is a population. 
C)  could be either a sample or a population. 
D)  is from a census. 
A)  is a sample. 
B)  is a population. 
C)  could be either a sample or a population. 
D)  is from a census.

Question 19

The variance of a sample of 100 observations equals 64.The standard deviation of the sample equals

Accepted Answer

A)  8. 
B)  10. 
C)  4096. 
D)  10,000. 
A)  8. 
B)  10. 
C)  4096. 
D)  10,000.

Question 20

The median is a measure of

Accepted Answer

A)  relative dispersion. 
B)  absolute dispersion. 
C)  central location. 
D)  relative location. 
A)  relative dispersion. 
B)  absolute dispersion. 
C)  central location. 
D)  relative location.

Geometric mean is a measure of

The coefficient of variation is the

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

Which of the following is not a measure of variability?

When data are positively skewed, the mean will usually be

A numerical value used as a summary measure for a sample is known as a sample

The average wage of Tennessee cashiers is $14 per hour with a standard deviation of $4.20.In Georgia, the average wage of cashiers is $16 with a standard deviation of $4.40.In which state do the wages of cashiers appear to be more dispersed?

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

A numerical measure of linear association between two variables is the

The value which has half of the observations above it and half the observations below it is called the

The mean of the sample

Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?

The coefficient of variation indicates how large the standard deviation is relative to the

In computing descriptive statistics for grouped data, the data values in each class are approximated using the

The variance of a sample was reported to be 144.The report indicated that = 7200.What is the sample size?

The first quartile is the same as the

When computing the mean, the smallest value

When n - 1 is used in the denominator to compute variance, the data set

The variance of a sample of 100 observations equals 64.The standard deviation of the sample equals

The median is a measure of

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

Geometric mean is a measure of

The coefficient of variation is the

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

Which of the following is not a measure of variability?

When data are positively skewed, the mean will usually be

A numerical value used as a summary measure for a sample is known as a sample

The average wage of Tennessee cashiers is $14 per hour with a standard deviation of $4.20.In Georgia, the average wage of cashiers is $16 with a standard deviation of $4.40.In which state do the wages of cashiers appear to be more dispersed?

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

A numerical measure of linear association between two variables is the

The value which has half of the observations above it and half the observations below it is called the

The mean of the sample

Generally, which one of the following is the least appropriate measure of central tendency for a data set that contains outliers?

The coefficient of variation indicates how large the standard deviation is relative to the​

​In computing descriptive statistics for grouped data, the data values in each class are approximated using the

The variance of a sample was reported to be 144.The report indicated that = 7200.What is the sample size?

The first quartile is the same as the

When computing the mean, the smallest value

When n - 1 is used in the denominator to compute variance, the data set

The variance of a sample of 100 observations equals 64.The standard deviation of the sample equals

The median is a measure of

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 coefficient of variation indicates how large the standard deviation is relative to the

In computing descriptive statistics for grouped data, the data values in each class are approximated using the