Question 1

$$\begin{array}{l}
\text { Construct a bar graph for the number of stray animals in a certain city. }\
\begin{array} { l | c } 
\text { Animal } & \text { Number of strays } \
\hline \text { Cats } & 723 \
\text { Dogs } & 576 \
\text { Rabbits } & 328 \
\text { Lizards } & 491
\end{array}
\end{array}$$

Accepted Answer

The answer of \[\begin{array}{l}
\text { Construct a bar graph for...

Question 2

The ages of 40 community college students were gathered. Construct a frequency distribution for the data using five classes.
$\begin{array} { l l l l l l l l } 46 & 17 & 34 & 19 & 42 & 19 & 20 & 48 \ 34 & 51 & 31 & 21 & 43 & 32 & 39 & 17 \ 21 & 21 & 40 & 38 & 42 & 17 & 21 & 45 \ 19 & 39 & 48 & 19 & 17 & 42 & 32 & 19 \ 49 & 19 & 26 & 38 & 43 & 46 & 51 & 39 \end{array}$

Accepted Answer

The answer of The ages of 40 community college students...

Question 3

$$\begin{array}{l}
\text { Find the value for the correlation coefficient } r \text {. }\
\begin{array} { c | c c c c c c } 
x & 10 & 8 & 7 & 12 & 14 & 5 \
\hline y & 20 & 19 & 17 & 25 & 28 & 9
\end{array}
\end{array}$$

Accepted Answer

A)   0.763
B)   0.968
C)   0.874
D)   0.551  B

Question 4

To obtain the frequency distribution below, twenty-three babies were monitored for how many times they cried during the night. Construct a histogram for the data.
$\begin{array}{l|c}
\text { Class } & \text { Frequency } \
\hline 0-2 & 4 \
3-5 & 6 \
6-8 & 9 \
9-11 & 3 \
12-14 & 1
\end{array}$

Accepted Answer

The answer of To obtain the frequency distribution below, twenty-three...

Question 5

$$\begin{array}{l}
\text { Draw a scatter plot for the data shown. }\
\begin{array} { c | c c c c c c } 
x & 28 & 19 & 25 & 22 & 30 & 18 \
\hline y & 10 & 5 & 2 & 7 & 1 & 9
\end{array}
\end{array}$$

Accepted Answer

The answer of \[\begin{array}{l}
\text { Draw a scatter plot for...

Question 6

The average hourly wage of employees of a certain company is $13.74. Assume the variable is normally distributed. If the standard deviation is $4.25, find the probability that a randomly selected employee earns more than $20.54.

Accepted Answer

The answer of The average hourly wage of employees of...

Question 7

Find the variance and standard deviation. 36) 16 6 14 50 6 46

Accepted Answer

The answer of Find the variance and standard deviation. 36)...

Question 8

Find the mode. 22 16 8 14 16 13 14 34

Accepted Answer

The answer of Find the mode. 22 16 8 14...

Question 9

Find the mode. 5 8 2 3 10 4 28 6 17 22

Accepted Answer

A)   7
B)   No mode
C)   8
D)   10.5

Question 10

These data represent the number of gas stations along a certain 50-mile length of desert road. Draw a time series graph for the data.
$\begin{array}{c|ccccc}
\text { Year } & 1971 & 1972 & 1973 & 1974 & 1975 \
\hline \text { Number } & 3 & 4 & 4 & 6 & 5
\end{array}$

Accepted Answer

The answer of These data represent the number of gas...

Question 11

For the following data
(a) Draw a scatter plot.
(b) Find the value for $r$.
(c) Test the significance of $r$ at the $5 \%$ level and at the $1 \%$ level.
(d) If $r$ is significant, find the regression line and draw the line on the scatter plot.
(e) Describe the nature of the relationship if one exists.
(f) Predict $y$ when $x = 41$.

$\begin{array}{c|cccccc}
x & 10 & 8 & 15 & 14 & 20 & 17 \
\hline y & 114 & 108 & 77 & 87 & 75 & 94
\end{array}$

Accepted Answer

The answer of For the following data
(a) Draw a scatter...

Question 12

For the 8 test scores shown, find the percentile rank of 68. 29 87 68 34 60 31 30 61

Accepted Answer

The answer of For the 8 test scores shown, find...

Question 13

The exam grades of 31 students were used to obtain the frequency distribution below. Construct a histogram and frequency polygon for the data.

$\begin{array}{c|c}
\text { Class } & \text { Frequency } \
\hline 40-49 & 1 \
50-59 & 2 \
60-69 & 5 \
70-79 & 12 \
80-89 & 7 \
90-99 & 4
\end{array}$

Accepted Answer

The answer of The exam grades of 31 students were...

Question 14

$$\begin{array}{l}
\text { Draw a scatter plot and describe the relationship. }\
\begin{array} { l | c c c c c c c } 
x & 7 & 1 & 3 & 5 & 6 & 2 & 4 \
\hline y & 10 & 11 & 4 & 3 & 5 & 6 & 3
\end{array}
\end{array}$$

Accepted Answer

The answer of \[\begin{array}{l}
\text { Draw a scatter plot and...

Question 15

$$\begin{array}{l}
\text { Find the equation of the regression line. }\
\begin{array} { c | c c c c c c } 
x & 10 & 8 & 7 & 12 & 14 & 5 \
\hline y & 20 & 19 & 17 & 25 & 28 & 9
\end{array}
\end{array}$$

Accepted Answer

A)   y = 2.5 + 2.7x
B)   y = 2.7 + 2.5x
C)   y = 1.9 + 1.7x
D)   y = 1.7 + 1.9x

Question 16

Draw a scatter plot for the data shown
$$\begin{array} { c | c c c c c c c } 
x & 2 & 7 & 3 & 4 & 5 & 1 & 6 \
\hline y & 6 & 1 & 5 & 3 & 6 & 12 & 2
\end{array}$$

Accepted Answer

The answer of Draw a scatter plot for the data...

Question 17

Fifty families reported their annual household income (in thousands of dollars). Construct a frequency distribution for the data using six classes.
$\begin{array} { l c c c c c c c c c } 41 & 18 & 104 & 36 & 29 & 62 & 53 & 65 & 80 & 99 \ 23 & 55 & 32 & 44 & 67 & 21 & 89 & 31 & 57 & 70 \ 15 & 92 & 76 & 38 & 56 & 23 & 17 & 150 & 34 & 87 \ 95 & 76 & 21 & 33 & 59 & 88 & 102 & 34 & 51 & 73 \ 16 & 95 & 41 & 72 & 18 & 23 & 76 & 59 & 42 & 95 \end{array}$

Accepted Answer

The answer of Fifty families reported their annual household income...

Question 18

The average hourly wage of employees of a certain company is $14.26. Assume the variable is normally distributed. If the standard deviation is $4.99, find the probability that a randomly selected employee earns less than $9.27.

Accepted Answer

A)   0.140 = 14.0%
B)   0.172 = 17.2%
C)   0.263 = 26.3%
D)   0.159 = 15.9%

Question 19

Construct a stem and leaf plot for the following data using whole numbers as stems and the decimals as leaves.
$\begin{array} { l l l l l } 5.3 & 2.4 & 7.1 & 4.8 & 6.2 \end{array}$
$\begin{array} { l l l l l } 3.1 & 7.8 & 6.4 & 2.7 & 2.5 \end{array}$
$\begin{array} { l l l l l } 7.1 & 3.6 & 5.9 & 5.4 & 3.2 \end{array}$
$\begin{array} { l l l } 4.4 & 7.6 & 2.5 \end{array}$

Accepted Answer

The answer of Construct a stem and leaf plot for...

Question 20

Suppose the average size (in square feet) of homes in a certain region is 2101. Assume the variable is normally distributed with standard deviation 120. If a person in the region was intending to build a 2227 square foot home but downsized and built a 1873 square foot home, what was the change in percentile rank from the original plan to the actual home that was built?

Accepted Answer

A)   The change in percentile rank is 71.
B)   The change in percentile rank is 94.
C)   The change in percentile rank is 82.
D)   The change in percentile rank is 12.

Exam 12: Voting Methods

$\begin{array}{l}\text { Construct a bar graph for the number of stray animals in a certain city. }\\\begin{array} { l | c } \text { Animal } & \text { Number of strays } \\\hline \text { Cats } & 723 \\\text { Dogs } & 576 \\\text { Rabbits } & 328 \\\text { Lizards } & 491\end{array}\end{array}$

$\begin{array}{l}\text { Find the value for the correlation coefficient } r \text {. }\\\begin{array} { c | c c c c c c } x & 10 & 8 & 7 & 12 & 14 & 5 \\\hline y & 20 & 19 & 17 & 25 & 28 & 9\end{array}\end{array}$

To obtain the frequency distribution below, twenty-three babies were monitored for how many times they cried during the night. Construct a histogram for the data. $\begin{array}{l|c}\text { Class } & \text { Frequency } \\\hline 0-2 & 4 \\3-5 & 6 \\6-8 & 9 \\9-11 & 3 \\12-14 & 1\end{array}$

$\begin{array}{l}\text { Draw a scatter plot for the data shown. }\\\begin{array} { c | c c c c c c } x & 28 & 19 & 25 & 22 & 30 & 18 \\\hline y & 10 & 5 & 2 & 7 & 1 & 9\end{array}\end{array}$

The average hourly wage of employees of a certain company is $13.74. Assume the variable is normally distributed. If the standard deviation is $4.25, find the probability that a randomly selected employee earns more than $20.54.

Find the variance and standard deviation. 36) 16 6 14 50 6 46

Find the mode. 22 16 8 14 16 13 14 34

Find the mode. 5 8 2 3 10 4 28 6 17 22

These data represent the number of gas stations along a certain 50-mile length of desert road. Draw a time series graph for the data. $\begin{array}{c|ccccc}\text { Year } & 1971 & 1972 & 1973 & 1974 & 1975 \\\hline \text { Number } & 3 & 4 & 4 & 6 & 5\end{array}$

For the 8 test scores shown, find the percentile rank of 68. 29 87 68 34 60 31 30 61

The exam grades of 31 students were used to obtain the frequency distribution below. Construct a histogram and frequency polygon for the data. $\begin{array}{c|c}\text { Class } & \text { Frequency } \\\hline 40-49 & 1 \\50-59 & 2 \\60-69 & 5 \\70-79 & 12 \\80-89 & 7 \\90-99 & 4\end{array}$

$\begin{array}{l}\text { Draw a scatter plot and describe the relationship. }\\\begin{array} { l | c c c c c c c } x & 7 & 1 & 3 & 5 & 6 & 2 & 4 \\\hline y & 10 & 11 & 4 & 3 & 5 & 6 & 3\end{array}\end{array}$

$\begin{array}{l}\text { Find the equation of the regression line. }\\\begin{array} { c | c c c c c c } x & 10 & 8 & 7 & 12 & 14 & 5 \\\hline y & 20 & 19 & 17 & 25 & 28 & 9\end{array}\end{array}$

Draw a scatter plot for the data shown $\begin{array} { c | c c c c c c c } x & 2 & 7 & 3 & 4 & 5 & 1 & 6 \\\hline y & 6 & 1 & 5 & 3 & 6 & 12 & 2\end{array}$

The average hourly wage of employees of a certain company is $14.26. Assume the variable is normally distributed. If the standard deviation is $4.99, find the probability that a randomly selected employee earns less than $9.27.

Exam 12: Voting Methods

The average hourly wage of employees of a certain company is $13.74. Assume the variable is normally distributed. If the standard deviation is $4.25, find the probability that a randomly selected employee earns more than $20.54.

Find the variance and standard deviation. 36) 16 6 14 50 6 46

Find the mode. 22 16 8 14 16 13 14 34

Find the mode. 5 8 2 3 10 4 28 6 17 22

For the 8 test scores shown, find the percentile rank of 68. 29 87 68 34 60 31 30 61

Draw a scatter plot for the data shown x2734516y61536122\begin{array} { c | c c c c c c c } x & 2 & 7 & 3 & 4 & 5 & 1 & 6 \\\hline y & 6 & 1 & 5 & 3 & 6 & 12 & 2\end{array}xy​26​71​35​43​56​112​62​​

The average hourly wage of employees of a certain company is $14.26. Assume the variable is normally distributed. If the standard deviation is $4.99, find the probability that a randomly selected employee earns less than $9.27.

Draw a scatter plot for the data shown $\begin{array} { c | c c c c c c c } x & 2 & 7 & 3 & 4 & 5 & 1 & 6 \\\hline y & 6 & 1 & 5 & 3 & 6 & 12 & 2\end{array}$