Question 1

The mean of a sample is

Accepted Answer

A)  always equal to the mean of the population. 
B)  always smaller than the mean of the population. 
C)  computed by summing the data values and dividing the sum by (n - 1). 
D)  computed by summing all the data values and dividing the sum by the number of items. 
A)  always equal to the mean of the population. 
B)  always smaller than the mean of the population. 
C)  computed by summing the data values and dividing the sum by (n - 1). 
D)  computed by summing all the data values and dividing the sum by the number of items.

Question 2

​The percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

Accepted Answer

A)  ​Chebyshev's theorem. 
B)  The empirical rule. 
C)  ​A five-number summary. 
D)  ​Percentiles. 
A)  ​Chebyshev's theorem. 
B)  The empirical rule. 
C)  ​A five-number summary. 
D)  ​Percentiles.

Question 3

In the fall semester of 2009, the average Graduate Management Admission Test (GMAT) of the students at UTC was 500 with a standard deviation of 80.In the fall of 2010, the average GMAT was 560 with a standard deviation of 84.Which year's GMAT scores show a more dispersed distribution?

Accepted Answer

The coefficient of variation i

Question 4

The geometric mean of 3, 5, and 6 is

Accepted Answer

A)  9.49. 
B)  2.41. 
C)  4.48. 
D)  3.74. 
A)  9.49. 
B)  2.41. 
C)  4.48. 
D)  3.74.

Question 5

The measure of variability easiest to compute, but seldom used as the only measure, is the​

Accepted Answer

A)  ​range. 
B)  ​interquartile range. 
C)  ​standard deviation. 
D)  ​variance. 
A)  ​range. 
B)  ​interquartile range. 
C)  ​standard deviation. 
D)  ​variance.

Question 6

Which of the following is not a measure of variability?

Accepted Answer

A)  The range 
B)  The midrange 
C)  The standard deviation 
D)  The interquartile range 
A)  The range 
B)  The midrange 
C)  The standard deviation 
D)  The interquartile range

Question 7

Consider a sample with the following data values.
​   ​
Compute the Z scores for the above five observations.

Accepted Answer

The answer of Consider a sample with the following data...

Question 8

The numerical value of the variance

Accepted Answer

A)  is always larger than the numerical value of the standard deviation. 
B)  is always smaller than the numerical value of the standard deviation. 
C)  is negative if the mean is negative. 
D)  can be larger or smaller than the numerical value of the standard deviation. 
A)  is always larger than the numerical value of the standard deviation. 
B)  is always smaller than the numerical value of the standard deviation. 
C)  is negative if the mean is negative. 
D)  can be larger or smaller than the numerical value of the standard deviation.

Question 9

The last semester grades of Nancy, 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 Nancy's semester grade point average.

Accepted Answer

The answer of The last semester grades of Nancy, a...

Question 10

​A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a

Accepted Answer

A)  ​geometric mean. 
B)  ​trimmed mean. 
C)  ​weighted mean. 
D)  ​balanced mean. 
A)  ​geometric mean. 
B)  ​trimmed mean. 
C)  ​weighted mean. 
D)  ​balanced mean.

Question 11

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. 
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.

Question 12

The measure of location which is the most likely to be influenced by extreme values in the data set is the

Accepted Answer

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

Question 13

The symbol σ 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. 
A)  variance of the population. 
B)  standard deviation of the sample. 
C)  standard deviation of the population. 
D)  variance of the sample.

Question 14

The measure of variability that is influenced most by extreme values is the

Accepted Answer

A)  variance. 
B)  standard deviation. 
C)  range. 
D)  interquartile range. 
A)  variance. 
B)  standard deviation. 
C)  range. 
D)  interquartile range.

Question 15

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)  19 
A)  16 
B)  17 
C)  18 
D)  19

Question 16

If a data set has an even number of observations, the median

Accepted Answer

A)  cannot be determined. 
B)  is the average value of the two middle items. 
C)  must be equal to the mean. 
D)  is the average value of the two middle items when all items are arranged in ascending order. 
A)  cannot be determined. 
B)  is the average value of the two middle items. 
C)  must be equal to the mean. 
D)  is the average value of the two middle items when all items are arranged in ascending order.

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. 
A)  9.06. 
B)  9.28. 
C)  86.19. 
D)  82.09.

Question 18

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

Accepted Answer

A)  13. 
B)  14. 
C)  15. 
D)  16. 
A)  13. 
B)  14. 
C)  15. 
D)  16.

Question 19

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. 
A)  12. 
B)  21. 
C)  441. 
D)  63,504.

Question 20

The geometric mean of four observations is the

Accepted Answer

A)  same as their weighted mean. 
B)  same as their arithmetic mean. 
C)  square root of the product of the 4 observations. 
D)  fourth root of the product of the 4 observations. 
A)  same as their weighted mean. 
B)  same as their arithmetic mean. 
C)  square root of the product of the 4 observations. 
D)  fourth root of the product of the 4 observations.

The mean of a sample is

The percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

In the fall semester of 2009, the average Graduate Management Admission Test (GMAT) of the students at UTC was 500 with a standard deviation of 80.In the fall of 2010, the average GMAT was 560 with a standard deviation of 84.Which year's GMAT scores show a more dispersed distribution?

The geometric mean of 3, 5, and 6 is

The measure of variability easiest to compute, but seldom used as the only measure, is the

Which of the following is not a measure of variability?

Consider a sample with the following data values. Compute the Z scores for the above five observations.

The numerical value of the variance

The last semester grades of Nancy, 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 Nancy's semester grade point average.

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a

Positive values of covariance indicate

The measure of location which is the most likely to be influenced by extreme values in the data set is the

The symbol σ is used to represent the

The measure of variability that is influenced most by extreme values is the

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

If a data set has an even number of observations, the median

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

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

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

The geometric mean of four observations is the

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

The mean of a sample is

​The percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

In the fall semester of 2009, the average Graduate Management Admission Test (GMAT) of the students at UTC was 500 with a standard deviation of 80.In the fall of 2010, the average GMAT was 560 with a standard deviation of 84.Which year's GMAT scores show a more dispersed distribution?

The geometric mean of 3, 5, and 6 is

The measure of variability easiest to compute, but seldom used as the only measure, is the​

Which of the following is not a measure of variability?

Consider a sample with the following data values. ​ ​ Compute the Z scores for the above five observations.

The numerical value of the variance

The last semester grades of Nancy, 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 Nancy's semester grade point average.

​A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a

Positive values of covariance indicate

The measure of location which is the most likely to be influenced by extreme values in the data set is the

The symbol σ is used to represent the

The measure of variability that is influenced most by extreme values is the

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

If a data set has an even number of observations, the median

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

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

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

The geometric mean of four observations is the

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 percentage of data values that must be within one, two, and three standard deviations of the mean for data having a bell-shaped distribution can be determined using

The measure of variability easiest to compute, but seldom used as the only measure, is the

Consider a sample with the following data values. Compute the Z scores for the above five observations.

The last semester grades of Nancy, 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 Nancy's semester grade point average.

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a