Question 1

Which difficulty of range as a measure of variability is overcome by interquartile range?

Accepted Answer

A)  The sum of the range variances is zero 
B)  The range is difficult to compute 
C)  The range is influenced too much by extreme values 
D)  The range is negative 
A)  The sum of the range variances is zero 
B)  The range is difficult to compute 
C)  The range is influenced too much by extreme values 
D)  The range is negative

Question 2

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.

Question 3

Growth factors for the population of Atlanta in the past five years have been 1, 2, 3, 4 , and 5. The geometric mean is

Accepted Answer

A)  15. 
B)    . 
C)    . 
D)    . 
A)  15. 
B)    . 
C)    . 
D)    .

Question 4

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 5

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 6

The geometric mean of 1, 2, 4, and 6 is

Accepted Answer

A)  6.93. 
B)  2.63. 
C)  1.90. 
D)  3.61. 
A)  6.93. 
B)  2.63. 
C)  1.90. 
D)  3.61.

Question 7

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 8

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 9

The empirical rule states that, for data having a bell-shaped distribution, the percentage of data values being within one standard deviation of the mean is approximately

Accepted Answer

A)  25%. 
B)  50%. 
C)  68%. 
D)  95%. 
A)  25%. 
B)  50%. 
C)  68%. 
D)  95%.

Question 10

Growth factors for the population of Chattanooga in the past two years have been 8 and 12. The geometric mean has a value of

Accepted Answer

A)  20. 
B)    . 
C)    . 
D)  96. 
A)  20. 
B)    . 
C)    . 
D)  96.

Question 11

The nth root of the product of the n observations is the

Accepted Answer

A)  weighted mean. 
B)  geometric mean. 
C)  product deviation. 
D)  product variance. 
A)  weighted mean. 
B)  geometric mean. 
C)  product deviation. 
D)  product variance.

Question 12

​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 13

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 14

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 15

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

Accepted Answer

A)  24. 
B)  25. 
C)  26. 
D)  27. 
A)  24. 
B)  25. 
C)  26. 
D)  27.

Question 16

The difference between the largest and the smallest data values is the

Accepted Answer

A)  variance. 
B)  interquartile range. 
C)  range. 
D)  coefficient of variation. 
A)  variance. 
B)  interquartile range. 
C)  range. 
D)  coefficient of variation.

Question 17

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 18

Which of the following is not a measure of central location?

Accepted Answer

A)  Mean 
B)  Median 
C)  Standard deviation 
D)  Mode 
A)  Mean 
B)  Median 
C)  Standard deviation 
D)  Mode

Question 19

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 20

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

Accepted Answer

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

Exam 3: Descriptive Statistics: Numerical Measures

Which difficulty of range as a measure of variability is overcome by interquartile range?

The geometric mean of four observations is the

Growth factors for the population of Atlanta in the past five years have been 1, 2, 3, 4 , and 5. The geometric mean is

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

The mean of the sample

The geometric mean of 1, 2, 4, and 6 is

The relative frequency of a class is computed by dividing the

The mean of a sample is

The empirical rule states that, for data having a bell-shaped distribution, the percentage of data values being within one standard deviation of the mean is approximately

Growth factors for the population of Chattanooga in the past two years have been 8 and 12. The geometric mean has a value of

The nth root of the product of the n observations is the

​For data skewed to the left, the skewness is

The numerical value of the variance

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

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

The difference between the largest and the smallest data values is the

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?

Which of the following is not a measure of central location?

A numerical measure of linear association between two variables is the

The most frequently occurring value of a data set is called 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

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Decision Analysis

Index Numbers

Statistical Methods for Quality Control

Sample Survey

Filters

For data skewed to the left, the skewness is

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