Question 1

Which of the following is not a measure of dispersion?

Accepted Answer

A) the range 
B) the 50th percentile 
C) the standard deviation 
D) the interquartile range 
A) the range 
B) the 50th percentile 
C) the standard deviation 
D) the interquartile range

Question 2

The population change between 2000 and 2010 for several small cities are shown below.
   
For the above sample,determine the following measures. 
a.The mean
b.The standard deviation
c.The median

Accepted Answer

a.1,164
b.

Question 3

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 4

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 5

The standard deviation of a sample was reported to be 7.The report indicated that   
= 980.What has been the sample size?

Accepted Answer

The answer of The standard deviation of a sample was...

Question 6

The Michael Painting Company has purchased paint from several suppliers.The purchase price per gallon and the number of gallons purchased are shown below.
   
Compute the weighted average price per gallon.

Accepted Answer

The answer of The Michael Painting Company has purchased paint...

Question 7

Which of the following is a measure of dispersion?

Accepted Answer

A) percentiles 
B) quartiles 
C) interquartile range 
D) all of the above are measures of dispersion 
A) percentiles 
B) quartiles 
C) interquartile range 
D) all of the above are measures of dispersion

Question 8

The starting salaries of a sample of college students are given below.
   
a.Compute the mean.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.34
b.35.

Question 9

A private research organization studying families in various countries reported the following data for the amount of time 4-year-old children spent alone with their fathers each day.
   
For the above sample,determine the following measures: 
a.The mean
b.The standard deviation
c.The mode
d.The 75th percentile

Accepted Answer

a.43
b.7.5

Question 10

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances.
   
a.Determine the mean unpaid balance.
b.Determine the variance.
c.Determine the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.74
b.533

Question 11

The price of a selected stock over a five day period is shown below.
17,11,13,17,16
Using the above data,compute the mean,the median,and the mode.

Accepted Answer

Mean = 14.

Question 12

Exhibit 3-1
The following data show the number of hours worked by 200 statistics students.
  
-Refer to Exhibit 3-1.The class width for this distribution

Accepted Answer

A) is 9 
B) is 10 
C) is 11 
D) varies from class to class 
A) is 9 
B) is 10 
C) is 11 
D) varies from class to class

Question 13

Exhibit 3-6
The closing stock price of MNM Corporation for the last 7 trading days is shown below.
  
-Refer to Exhibit 3-6.The mean is

Accepted Answer

A) 84 
B) 85 
C) 86 
D) 87 
A) 84 
B) 85 
C) 86 
D) 87

Question 14

Since the median is the middle value of a data set it

Accepted Answer

A) must always be smaller than the mode 
B) must always be larger than the mode 
C) must always be smaller than the mean 
D) None of these alternatives is correct. 
A) must always be smaller than the mode 
B) must always be larger than the mode 
C) must always be smaller than the mean 
D) None of these alternatives is correct.

Question 15

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 at...

Question 16

Exhibit 3-3
A researcher has collected the following sample data.The mean of the sample is 5.
  
-Refer to Exhibit 3-3.The interquartile range is

Accepted Answer

A) 1 
B) 2 
C) 10 
D) 12 
A) 1 
B) 2 
C) 10 
D) 12

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

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 19

If index i (which is used to determine the location of the pth percentile)is not an integer,its value should be

Accepted Answer

A) squared 
B) divided by (n - 1) 
C) rounded down 
D) rounded up 
A) squared 
B) divided by (n - 1) 
C) rounded down 
D) rounded up

Question 20

If two groups of numbers have the same mean,then

Accepted Answer

A) their standard deviations must also be equal 
B) their medians must also be equal 
C) their modes must also be equal 
D) None of these alternatives is correct. 
A) their standard deviations must also be equal 
B) their medians must also be equal 
C) their modes must also be equal 
D) None of these alternatives is correct.

Exam 3: Descriptive Statistics: Numerical Measures

Which of the following is not a measure of dispersion?

The population change between 2000 and 2010 for several small cities are shown below. For the above sample,determine the following measures. a.The mean b.The standard deviation c.The median

When computing the mean,the smallest value

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

The standard deviation of a sample was reported to be 7.The report indicated that = 980.What has been the sample size?

The Michael Painting Company has purchased paint from several suppliers.The purchase price per gallon and the number of gallons purchased are shown below. Compute the weighted average price per gallon.

Which of the following is a measure of dispersion?

The starting salaries of a sample of college students are given below. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. a.Determine the mean unpaid balance. b.Determine the variance. c.Determine the standard deviation. d.Compute the coefficient of variation.

The price of a selected stock over a five day period is shown below. 17,11,13,17,16 Using the above data,compute the mean,the median,and the mode.

Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. -Refer to Exhibit 3-1.The class width for this distribution

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6.The mean is

Since the median is the middle value of a data set it

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.

Exhibit 3-3 A researcher has collected the following sample data.The mean of the sample is 5. -Refer to Exhibit 3-3.The interquartile range is

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?

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

If index i (which is used to determine the location of the pth percentile)is not an integer,its value should be

If two groups of numbers have the same mean,then

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Statistical Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit and Independence

Analysis of Variance and Experimental Design

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Index Numbers

Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters