Question 1

Using the following data,describe the shape of the data distribution. $\begin{array}{llllllll}
\text { 1. } & 11.5 & 6 . & 13.7 & 11 . & 11.0 & 16 . & 14.5 \
\text { 2. } & 13.5 & 7 . & 14.0 & 12 . & 13.0 & 17 . & 15.5 \
\text { 3. } & 12.5 & 8 . & 12.0 & 13 . & 16.7 & 18 . & 13.0 \
\text { 4. } & 15.2 & 9 . & 12.7 & 14 . & 12.5 & 19 . & 18.2 \
\text { 5. } & 14.7 & 10 . & 12.5 & 15 . & 11.5 & 20 . & 11.7
\end{array}$

Accepted Answer

A)  Skewed to the left
B)  Bimodal
C)  Normal
D)  Skewed to the right  D

Question 2

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below.
24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50
Construct a stem-and-leaf plot.

Accepted Answer

$\begin{array} { l } 
\text { Stem-and-leaf of Sales Calls } \
\mathrm { N } = 25 \
\text { Leaf Unit } = 1.0 \
\begin{array} { l l l } 
1 & 2 & 4 \
7 & 2 & 778899 \
12 & 3 & 11334 \
( 5 ) & 3 & 57788 \
8 & 4 & 0134 \
4 & 4 & 68 \
2 & 5 & 0 \
1 & 5 & 6
\end{array}
\end{array}$ Feedback:The stem should be split and consist of 20,30,40,and 50.Leaves are the single units for the number of sales calls .

Question 3

Splitting the stems refers to assigning the same stem to two or more rows of the stem-and-leaf display.

Accepted Answer

A) True 
 B)False  True

Question 4

A Stem-and-leaf display is best used to ___________.

Accepted Answer

A)  Provide a point estimate of the variability of the data set
B)  Provide a point estimate of the central tendency of the data set
C)  Display the shape of the distribution
D)  None of these

Question 5

The following data consist of the number of sick days taken by the 100 employees at a small manufacturing company for the past 18 months.Construct a dot plot of these data and describe the distribution.
5,1,4,8,0,6,3,5,3,4,7,15,5,8,2,1,5,4

Accepted Answer

The answer of The following data consist of the number...

Question 6

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below.
24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50
Construct a frequency polygon.

Accepted Answer

The answer of The number of weekly sales calls by...

Question 7

Which of the following graphical tools is not used to study the shapes of distributions?

Accepted Answer

A)  Stem-and-leaf display
B)  Scatter plot
C)  Histogram
D)  Dot plot

Question 8

Using the following data,what would be the leaf unit in a stem-and-leaf display? $\begin{array}{llllllll}
\text { 1. } & 11.5 & 6 . & 13.7 & 11 . & 11 & 16 . & 14.5 \
\text { 2. } & 13.5 & 7 . & 14 & 12 . & 13 & 17 . & 15.5 \
\text { 3. } & 12.5 & 8 . & 12 & 13 . & 16.7 & 18 . & 13 \
\text { 4. } & 15.2 & 9 . & 12.7 & 14 . & 12.5 & 19 . & 18.2 \
\text { 5. } & 14.7 & 10 . & 12.5 & 15 . & 11.5 & 20 . & 11.7
\end{array}$

Accepted Answer

A)  1.0
B)  10
C)  .10
D)  .01
E)  .20

Question 9

A ______________ shows the relationship between two variables.

Accepted Answer

A)  Stem-and-leaf
B)  Bar chart
C)  Histogram
D)  Scatter plot
E)  Pie chart

Question 10

A CFO is looking at how much of a company's resources are spent on computing.He samples companies in the pharmaceutical industry and develops the following stem-and-leaf graph. $\begin{array} { l l } 
5 & 269 \
6 & 255568999 \
7 & 11224557789 \
8 & 001222458 \
9 & 02455679 \
10 & 1556 \
11 & 137 \
12 & \
13 & 255
\end{array}$
What is the approximate shape of the distribution of the data?

Accepted Answer

A)  Normal
B)  Skewed to the right
C)  Skewed to the left
D)  Bimodal
E)  Uniform

Question 11

In the first step of setting up a Pareto chart,a frequency table should be constructed of the defects (or categories)in decreasing order of frequency.

Accepted Answer

A) True 
 B)False

Question 12

When establishing the classes for a frequency table,it is generally agreed that the more classes you use the better your frequency table will be.

Accepted Answer

A) True 
 B)False

Question 13

Fill in the missing components of the following frequency distribution constructed for a sample size of 50.

Accepted Answer

The answer of Fill in the missing components of the...

Question 14

A local electronics retailer recently conducted a study on purchasers of large screen televisions.The study recorded the type of television and the credit account balance of the customer at the time of purchase.They obtained the following results.

Accepted Answer

The answer of A local electronics retailer recently conducted a...

Question 15

A(n)______ is a graph of a cumulative distribution.

Accepted Answer

A)  Histogram
B)  Scatter plot
C)  Ogive plot
D)  Pie chart

Question 16

A bar chart is a graphic that can be used to depict qualitative data.

Accepted Answer

A) True 
 B)False

Question 17

If there are 62 values in a data set,how many classes should be created for a frequency histogram?

Accepted Answer

A)  4
B)  5
C)  6
D)  7
E)  8

Question 18

At the end of their final exam,550 students answered an additional question in which they rated their instructor's teaching effectiveness,with the following results. $ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$ \quad$$\text { Student's Rating of Instructor }$
$\begin{array} { | c | c | c | } 
\hline \begin{array} { c } 
\text { Student's } \
\text { Final Grade }
\end{array} & \text { Very or Somewhat Effective } & \text { Very or Somewhat Ineffective } \
\hline \text { A } & 190 & 85 \
\hline \text { B } & 75 & 120 \
\hline \text { C } & 20 & 17 \
\hline \text { D } & 9 & 18 \
\hline \text { F } & 1 & 15 \
\hline
\end{array}$
What proportion of the students who rated their instructor as very or somewhat effective received a B or better in the class?

Accepted Answer

A)  0.345
B)  0.254
C)  0.482
D)  0.898
E)  0.644

Question 19

The percentage of measurements in a class is called the ___________ of that class.

Accepted Answer

A)  Frequency
B)  Relative frequency
C)  Leaf
D)  Cumulative percentage

Question 20

A ______________ can be used to differentiate the "vital few" causes of quality problems from the "trivial many" causes of quality problems.

Accepted Answer

A)  Histogram
B)  Scatter plot
C)  Pareto chart
D)  Ogive plot
E)  Stem-and-leaf display

Exam 2: Descriptive Statistics: Tabular and Graphical Methods

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50 Construct a stem-and-leaf plot.

Splitting the stems refers to assigning the same stem to two or more rows of the stem-and-leaf display.

A Stem-and-leaf display is best used to ___________.

The following data consist of the number of sick days taken by the 100 employees at a small manufacturing company for the past 18 months.Construct a dot plot of these data and describe the distribution. 5,1,4,8,0,6,3,5,3,4,7,15,5,8,2,1,5,4

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50 Construct a frequency polygon.

Which of the following graphical tools is not used to study the shapes of distributions?

A ______________ shows the relationship between two variables.

In the first step of setting up a Pareto chart,a frequency table should be constructed of the defects (or categories)in decreasing order of frequency.

When establishing the classes for a frequency table,it is generally agreed that the more classes you use the better your frequency table will be.

Fill in the missing components of the following frequency distribution constructed for a sample size of 50.

A local electronics retailer recently conducted a study on purchasers of large screen televisions.The study recorded the type of television and the credit account balance of the customer at the time of purchase.They obtained the following results.

A(n) ______ is a graph of a cumulative distribution.

A bar chart is a graphic that can be used to depict qualitative data.

If there are 62 values in a data set,how many classes should be created for a frequency histogram?

The percentage of measurements in a class is called the ___________ of that class.

A ______________ can be used to differentiate the "vital few" causes of quality problems from the "trivial many" causes of quality problems.