Question 1

The units for the variance are the same as the units for the original data (for example,feet,inches,etc. ).

Accepted Answer

A) True 
 B)False

Question 2

Weights of Police Officers
The following data represent the weights in pounds of a sample of 25 police officers: 164,148,137,157,173,156,177,172,169,165,145,168,163,162,174,152,156,168,154,151,174,146,134,140,and 171.
-{Weights of Police Officers Narrative} Determine the location and value of the lower quartile of the weights.

Accepted Answer

Location = L<sub>25<

Question 3

A mutual fund you purchased in the years 2011-2014 has the following rates of return shown below:
 $$\begin{array} { | l | c | c | c | c | } 
\hline \text { Year } & 2011 & 2012 & 2013 & 2014 \
\hline \text { Rate of Return } & .50 & .30 & - .10 & - .15 \
\hline
\end{array}$$ Compute the geometric mean.

Accepted Answer

\[\begin{aligned}
R _ { g } & = \sqrt [

Question 4

The ____________________ uses both the mean and the standard deviation to interpret standard deviation for bell shaped histograms.

Accepted Answer

The answer of The ____________________ uses both the mean and...

Question 5

Strip Mall Rent
Monthly rent data in dollars for a sample of 10 stores in a small town in South Dakota are as follows: 220,216,220,205,210,240,195,235,204,and 250.
-{Strip Mall Rent Narrative} Compute the sample monthly average rent.

Accepted Answer

The answer of Strip Mall Rent
Monthly rent data in dollars...

Question 6

Hours of Playing Video Games
Suppose that the following data provide the hours of playing video games per week for a sample of 15 high school students in Roanoke,Virginia: 5,11,25,19,18,20,27,13,8,10,15,19,18,9,and 12.
-{Hours of Playing Video Games Narrative} Determine the location and value of the first quartile.

Accepted Answer

Location =

Question 7

A box plot is a graphical representation of the 5-number summary.

Accepted Answer

A) True 
 B)False

Question 8

Salaries of Employees
The following data represent the yearly salaries (in thousands of dollars)of a sample of 13 employees of a firm: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2.
-{Salaries of Employees Narrative} Compare the mean salary with the median salary and use them to describe the shape of the distribution.

Accepted Answer

The mean is $24,692 thousand dollars,and

Question 9

Hours Worked per Week
The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35,and 20.
-{Hours Worked per Week Narrative} Find the median hours.

Accepted Answer

The answer of Hours Worked per Week
The following data represent...

Question 10

Which of the following summary measures is sensitive to extreme values?

Accepted Answer

A)  The median 
B)  The interquartile range 
C)  The mean 
D)  The first quartile 
A)  The median 
B)  The interquartile range 
C)  The mean 
D)  The first quartile

Question 11

Hours Worked per Week
The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35,and 20.
-{Hours Worked per Week Narrative} Construct a stem and leaf display for the hours.

Accepted Answer

\[\begin{array} { l | l } 
\te

Question 12

Yearly Donations
The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2.
-{Yearly Donations Narrative} Compute the lower quartile for the donations.

Accepted Answer

Location = L₂₅ = 3.

Question 13

Ages of Jockeys
The following data represent the ages in years of a sample of 25 jockeys from a local race track: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35,and 20.
-{Ages of Jockeys Narrative} Construct a relative frequency distribution for the data,using five class intervals and the value 20 as the lower limit of the first class.

Accepted Answer

\[\begin{array} { | c | c | } 
\hline \t

Question 14

Ages of Workers
The ages (in years)of three groups of workers are shown below:
 $$\begin{array} { c l l l l l } 
\text { Group A: } & 17 & 22 & 20 & 18 & 23 \
\text { Group B: } & 30 & 28 & 35 & 40 & 25 \
\text { GroupC:} & 44 & 39 & 54 & 21 & 52
\end{array}$$
-{Ages of Workers Narrative} Compute and compare the ranges for the three groups.

Accepted Answer

Range = 6,15,and 33 (years)for Groups A,

Question 15

When extreme values are present in a set of data,which of the following descriptive summary measures are most appropriate?

Accepted Answer

A)  Coefficient of variation and range 
B)  Mean and standard deviation 
C)  Interquartile range and median 
D)  Variance and interquartile range 
A)  Coefficient of variation and range 
B)  Mean and standard deviation 
C)  Interquartile range and median 
D)  Variance and interquartile range

Question 16

Computers
The following data represent the number of computers owned by a sample of 10 families from Chicago: 4,2,1,1,5,3,0,1,0,and 2.
-{Computers Narrative} Compute the mean number of computers.

Accepted Answer

The answer of Computers
The following data represent the number of...

Question 17

Weights of Police Officers
The following data represent the weights in pounds of a sample of 25 police officers: 164,148,137,157,173,156,177,172,169,165,145,168,163,162,174,152,156,168,154,151,174,146,134,140,and 171.
-{Weights of Police Officers Narrative} Determine the location and value of the second quartile of the weights.

Accepted Answer

Location =

Question 18

The standard deviation is the positive square root of the variance.

Accepted Answer

A) True 
 B)False

Question 19

Pets Survey
A sample of 36 families were asked how many pets they owned.Their responses are summarized in the following table.
 $$\begin{array} { | l | l l l l l l | } 
\hline \text { Number of Pets } & 0 & 1 & 2 & 3 & 4 & 5 \
\hline \text { Number of Families } & 3 & 20 & 5 & 4 & 2 & 2 \
\hline
\end{array}$$
-{Pets Survey Narrative} Explain what the mean,median,and mode tell you about this particular data set.

Accepted Answer

The "average" number of pets owned was 1

Question 20

In a histogram,the proportion of the total area which must be to the right of the mean is exactly 0.50 if the distribution is symmetric and unimodal.

Accepted Answer

A) True 
 B)False

Exam 4: A: Numerical Descriptive Techniques

The units for the variance are the same as the units for the original data (for example,feet,inches,etc. ).

A mutual fund you purchased in the years 2011-2014 has the following rates of return shown below: Year 2011 2012 2013 2014 Rate of Return .50 .30 -.10 -.15 Compute the geometric mean.

The ____________________ uses both the mean and the standard deviation to interpret standard deviation for bell shaped histograms.

Strip Mall Rent Monthly rent data in dollars for a sample of 10 stores in a small town in South Dakota are as follows: 220,216,220,205,210,240,195,235,204,and 250. -{Strip Mall Rent Narrative} Compute the sample monthly average rent.

A box plot is a graphical representation of the 5-number summary.

Hours Worked per Week The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35,and 20. -{Hours Worked per Week Narrative} Find the median hours.

Which of the following summary measures is sensitive to extreme values?

Hours Worked per Week The following data represent the hours worked per week of a sample of 25 employees from a government department: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35,and 20. -{Hours Worked per Week Narrative} Construct a stem and leaf display for the hours.

Yearly Donations The following data represent the yearly donations (in thousands of dollars)of a sample of 13 benefactors: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. -{Yearly Donations Narrative} Compute the lower quartile for the donations.

Ages of Workers The ages (in years)of three groups of workers are shown below: Group A: 17 22 20 18 23 Group B: 30 28 35 40 25 GroupC: 44 39 54 21 52 -{Ages of Workers Narrative} Compute and compare the ranges for the three groups.

When extreme values are present in a set of data,which of the following descriptive summary measures are most appropriate?

Computers The following data represent the number of computers owned by a sample of 10 families from Chicago: 4,2,1,1,5,3,0,1,0,and 2. -{Computers Narrative} Compute the mean number of computers.

The standard deviation is the positive square root of the variance.

Pets Survey A sample of 36 families were asked how many pets they owned.Their responses are summarized in the following table. Number of Pets 0 1 2 3 4 5 Number of Families 3 20 5 4 2 2 -{Pets Survey Narrative} Explain what the mean,median,and mode tell you about this particular data set.

In a histogram,the proportion of the total area which must be to the right of the mean is exactly 0.50 if the distribution is symmetric and unimodal.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

B: Numerical Descriptive Techniques

C: Numerical Descriptive Techniques

Data Collection and Sampling

Probability

A: Random Variables and Discrete Probability Distributions

B: Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

A: Simple Linear Regression and Correlation

B: Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analysis and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

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