Question 1

Exhibit 3-5
You are given the following frequency distribution.  
-Refer to Exhibit 3-5. The variance is

Accepted Answer

A) 570 
B) 5.477 
C) 500 
D) 30 
A) 570 
B) 5.477 
C) 500 
D) 30

Question 2

The hourly wages of a sample of eight individuals is given below.   For the above sample, determine the following measures: 
a.The mean.
b.The standard deviation.
c.The 25th percentile.

Accepted Answer

The answer of The hourly wages of a sample of...

Question 3

The amount of time that a sample of students spends watching television per day is given below.   
a.Compute the mean.
b.Compute the median.
c.Compute the standard deviation.
d.Compute the 75th percentile.

Accepted Answer

a.46
b.44

Question 4

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 5

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

Accepted Answer

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

Question 6

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 7

The following frequency distribution shows the starting salaries (in $1,000s) of a sample of business students:   For the above data, compute the mean starting salary: (Give your answer in dollars.)

Accepted Answer

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

Question 8

Exhibit 3-3
A researcher has collected the following sample data. The mean of the sample is 5.
3 5 12 3 2
-Refer to Exhibit 3-3. The coefficient of variation is

Accepted Answer

A) 72.66% 
B) 81.24% 
C) 264% 
D) 330% 
A) 72.66% 
B) 81.24% 
C) 264% 
D) 330%

Question 9

Exhibit 3-4
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.  
-Refer to Exhibit 3-4. The standard deviation is

Accepted Answer

A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000 
A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000

Question 10

The number of hours worked per week for a sample of ten students is shown below.   
a.Determine the median and explain its meaning.
b.Compute the 70th percentile and explain its meaning.
c.What is the mode of the above data? What does it signify?

Accepted Answer

a.19; approximately 50% of the

Question 11

When the smallest and largest percentage of items are removed from a data set and the mean is computed, the mean of the remaining data is

Accepted Answer

A) the median 
B) the mode 
C) the trimmed mean 
D) any of the above 
A) the median 
B) the mode 
C) the trimmed mean 
D) any of the above

Question 12

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

Accepted Answer

A) $\sigma$2 
B) $\sigma$ 
C) $\mu$ 
D)    
A) $\sigma$2 
B) $\sigma$ 
C) $\mu$ 
D)

Question 13

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 14

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 15

A numerical measure of linear association between two variables is the

Accepted Answer

A) variance 
B) coefficient of variation 
C) correlation coefficient 
D) standard deviation 
A) variance 
B) coefficient of variation 
C) correlation coefficient 
D) standard deviation

Question 16

The frequency distribution below shows the monthly expenditure on gasoline for a sample of 14 individuals.   
a.Compute the mean.
b.Compute the standard deviation.

Accepted Answer

The answer of The frequency distribution below shows the monthly...

Question 17

The growth rate in thepopulation of Atlanta for the past five years are shown below.   
a.Compute the Geometric mean
b.What has been the percentage growth in the population of Atlanta?

Accepted Answer

a.1.028977

Question 18

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

Accepted Answer

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

Question 19

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true?

Accepted Answer

A) the data set is a sample 
B) the data set is a population 
C) the data set could be either a sample or a population 
D) the data set is from a census 
A) the data set is a sample 
B) the data set is a population 
C) the data set could be either a sample or a population 
D) the data set is from a census

Question 20

Exhibit 3-4
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.  
-Refer to Exhibit 3-4. The variance is

Accepted Answer

A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000 
A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000

Exam 3: Descriptive Statistics: Numerical Measures

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5. The variance is

The hourly wages of a sample of eight individuals is given below. For the above sample, determine the following measures: a.The mean. b.The standard deviation. c.The 25th percentile.

The amount of time that a sample of students spends watching television per day is given below. a.Compute the mean. b.Compute the median. c.Compute the standard deviation. d.Compute the 75th percentile.

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

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

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.

The following frequency distribution shows the starting salaries (in $1,000s) of a sample of business students: For the above data, compute the mean starting salary: (Give your answer in dollars.)

Exhibit 3-3 A researcher has collected the following sample data. The mean of the sample is 5. 3 5 12 3 2 -Refer to Exhibit 3-3. The coefficient of variation is

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The standard deviation is

The number of hours worked per week for a sample of ten students is shown below. a.Determine the median and explain its meaning. b.Compute the 70th percentile and explain its meaning. c.What is the mode of the above data? What does it signify?

When the smallest and largest percentage of items are removed from a data set and the mean is computed, the mean of the remaining data is

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

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.

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

A numerical measure of linear association between two variables is the

The frequency distribution below shows the monthly expenditure on gasoline for a sample of 14 individuals. a.Compute the mean. b.Compute the standard deviation.

The growth rate in thepopulation of Atlanta for the past five years are shown below. a.Compute the Geometric mean b.What has been the percentage growth in the population of Atlanta?

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true?

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The variance is

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, Test 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

Statistical Methods for Quality Control

Index Numbers

Decision Analysis on Website

Sample Survey on Website

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