Question 1

For the following frequency distribution (assume the data represent a population),
   
a.Compute the mean.
b.Compute the standard deviation.

Accepted Answer

a.95
b.12.

Question 2

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

Accepted Answer

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

Question 3

The median of a sample will always equal the

Accepted Answer

A) mode 
B) mean 
C) 50th percentile 
D) all of the above answers are correct 
A) mode 
B) mean 
C) 50th percentile 
D) all of the above answers are correct

Question 4

The following shows the number of job losses and gains (in thousands)between 2008 and 2009 for a sample of seven cities.
   
a.Compute the mean.
b.Determine the mode.
c.Determine the median.
d.Determine the standard deviation.

Accepted Answer

a.-4000
b.

Question 5

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 6

In computing the mean of a sample,the value of $\Sigma$xi is divided by

Accepted Answer

A) n 
B) n - 1 
C) n + 1 
D) n - 2 
A) n 
B) n - 1 
C) n + 1 
D) n - 2

Question 7

The sum of deviations of the individual data elements from their mean is

Accepted Answer

A) always greater than zero 
B) always less than zero 
C) sometimes greater than and sometimes less than zero,depending on the data elements 
D) always equal to zero 
A) always greater than zero 
B) always less than zero 
C) sometimes greater than and sometimes less than zero,depending on the data elements 
D) always equal to zero

Question 8

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

Question 9

Descriptive statistics for the closing stock prices of two companies for several trading periods are shown below.
   
a.Which company's stock price has a more dispersed distribution? Explain.Show your complete work and support your answer.
b.Compare the Skewness of the two and explain what is indicated.

Accepted Answer

a.Coefficient of variation for Baba,Inc

Question 10

Which of the following provides a measure of central location for the data?

Accepted Answer

A) standard deviation 
B) mean 
C) variance 
D) range 
A) standard deviation 
B) mean 
C) variance 
D) range

Question 11

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 12

In 2009,the average donation to the Help Way was $225 with a standard deviation of $45.In 2010,the average donation was $400 with a standard deviation of $60.In which year did the donations show a more dispersed distribution?

Accepted Answer

The coefficient of variation i

Question 13

Jason,a freshman at a local college,just completed 15 credit hours.His grade report is presented below.
   
The local university uses a 4 point grading system,i.e. ,A = 4,B = 3,C = 2,D = 1,F = 0.Compute Jason's semester grade point average.

Accepted Answer

The answer of Jason,a freshman at a local college,just completed...

Question 14

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 15

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

Accepted Answer

A) 8 
B) 10 
C) 6400 
D) 4,096 
A) 8 
B) 10 
C) 6400 
D) 4,096

Question 16

Exhibit 3-2
A researcher has collected the following sample data
  
-Refer to Exhibit 3-2.The mean is

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 8 
A) 5 
B) 6 
C) 7 
D) 8

Question 17

When computing the mean of a set of values xi,the value of  $\Sigma$xi

Accepted Answer

A) can never be zero 
B) can never be negative 
C) must always be positive 
D) can be any value 
A) can never be zero 
B) can never be negative 
C) must always be positive 
D) can be any value

Question 18

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 19

Exhibit 3-2
A researcher has collected the following sample data
  
-Refer to Exhibit 3-2.The median is

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 8 
A) 5 
B) 6 
C) 7 
D) 8

Question 20

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...

Exam 3: Descriptive Statistics: Numerical Measures

For the following frequency distribution (assume the data represent a population), a.Compute the mean. b.Compute the standard deviation.

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

The median of a sample will always equal the

The following shows the number of job losses and gains (in thousands)between 2008 and 2009 for a sample of seven cities. a.Compute the mean. b.Determine the mode. c.Determine the median. d.Determine the standard deviation.

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

In computing the mean of a sample,the value of Σ\SigmaΣ xi is divided by

The sum of deviations of the individual data elements from their mean is

The median is a measure of

Which of the following provides a measure of central location for the data?

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?

In 2009,the average donation to the Help Way was $225 with a standard deviation of $45.In 2010,the average donation was $400 with a standard deviation of $60.In which year did the donations show a more dispersed distribution?

Jason,a freshman at a local college,just completed 15 credit hours.His grade report is presented below. The local university uses a 4 point grading system,i.e. ,A = 4,B = 3,C = 2,D = 1,F = 0.Compute Jason's semester grade point average.

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

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

Exhibit 3-2 A researcher has collected the following sample data -Refer to Exhibit 3-2.The mean is

When computing the mean of a set of values xi,the value of Σ\SigmaΣ xi

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?

Exhibit 3-2 A researcher has collected the following sample data -Refer to Exhibit 3-2.The median is

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. )

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

In computing the mean of a sample,the value of $\Sigma$ x_i is divided by

When computing the mean of a set of values x_i,the value of $\Sigma$ x_i