Question 1

Analysis of the data from 25 mothers indicates that an infant's birth weight $( \mathrm { g } ) , y$ can be estimated by a mother's weight  (kg), x , using the regression equation $y = 31 x + 1501$
If a mother's weight is  70 kg the infant's birth weight can be estimated as _________$g .$

Accepted Answer

To estimate the infant's birth weight for a mother weighing 70 kg, substitute $x = 70$ into the regression equation $y = 31x + 1501$. This gives $y = 31(70) + 1501 = 2170 + 1501 = 3671$ grams.

Question 2

$$\begin{array} { c c c c c c c c c } 
x & 0.51 & 0.02 & 0.14 & 0.29 & 0.34 & 0.8 & 0.47 & 0.71 \
y & 0.31 & 0.46 & - 0.12 & 0.34 & - 0.05 & 0.8 & 0.35 & 0.47
\end{array}$$ Which of these choices display the correct scatterplot?

Accepted Answer

D

Question 3

A store manager counts the number of customers who make a purchase in his store each_ day. The data are as follows. $\begin{array} { l l l l l l l l l l } 10 & 11 & 8 & 14 & 7 & 10 & 10 & 11 & 8 & 7 \end{array}$
Which of these choices display the correct dotplot?

Accepted Answer

A

Question 4

The weights (in pounds)of 22 members of the junior varsity football team are listed below. $\begin{array} { l l l l l l l l l l l } 144 & 152 & 142 & 151 & 160 & 152 & 131 & 164 & 141 & 153 & 140 \end{array}$
$\begin{array} { l l l l l l l l l l l l } 144 & 175 & 156 & 147 & 133 & 172 & 159 & 135 & 159 & 148 & 171 \end{array}$
Which of these choices display the correct stemplot?

Accepted Answer

The stem-and-leaf plot should be arranged in ascending order of the stems.

Question 5

A nurse measured the blood pressure of each person who visited her clinic. Following is a_ relative-frequency histogram for the systolic blood pressure readings for those people
Aged between 25 and 40 years. The blood pressure readings were given to the nearest
Whole number. Approximately what percentage of the people aged 25 -40 had a systolic
Blood pressure reading between 110 and 119 mm Hg inclusive? Systolic Blood Pressure for People Aged 25 - 40 Years

Accepted Answer

The answer of A nurse measured the blood pressure of...

Question 6

The attendance counts for this season's basketball games are listed below. Which of these choices display the correct stemplot? $\begin{array} { l l l l } 227 & 239 & 215 & 219 \end{array}$
$\begin{array} { l l l l } 221 & 233 & 229 & 233 \end{array}$
$\begin{array} { l l l l } 235 & 228 & 245 & 231 \end{array}$

Accepted Answer

The correct stemplot (A) accurately groups the attendance counts by their tens place (the stem) and lists all the ones places (the leaves) in ascending order for each group.

Question 7

The histogram below represents the number of television sets per household for a sample of U.S. households. What is the sample size? Number of Television Sets Per U.S. Household

Accepted Answer

The answer of The histogram below represents the number of...

Question 8

A nurse measured the blood pressure of each person who visited her clinic. Following is a_ relative-frequency histogram for the systolic blood pressure readings for those people
Aged between 25 and 40 years. The blood pressure readings were given to the nearest
Whole number. Approximately what percentage of the people aged 25 -40 had a systolic
Blood pressure reading between 110 and 139 mm Hg inclusive?
Systolic Blood Pressure for People Aged 25 - 40 Years

Accepted Answer

The answer of A nurse measured the blood pressure of...

Question 9

The following frequency distribution represents the scores on a math test. Find the class_ midpoint of scores for the interval 40-59. $$\begin{array} { c c } 
\hline \text { Scores } & \text { Number of students } \
\hline 50 - 59 & 2 \
60 - 69 & 4 \
70 - 79 & 6 \
80 - 89 & 15 \
90 - 99 & 5 \
\hline
\end{array}$$

Accepted Answer

The class midpoint is calculated by averaging the lower and upper boundaries of the class interval: (40 + 59) / 2 = 49.5.

Question 10

The frequency distribution below summarizes employee years of service for Alpha Corporation. Find the class midpoint for class 1 -5. $$\begin{array} { c | c } 
\text { Years of Service } & \text { Frequency } \
\hline 1 - 5 & 5 \
6 - 10 & 20 \
11 - 15 & 25 \
16 - 20 & 10 \
21 - 25 & 5 \
26 - 30 & 3
\end{array}$$

Accepted Answer

The answer of The frequency distribution below summarizes employee years...

Question 11

The two key parts of a regression equation involve the ____________ and the y-____________.

Accepted Answer

The two key parts of a regression equation are the slope (which represents the rate of change of the independent variable with respect to the dependent variable) and the y-intercept (which represents the value of the dependent variable when the independent variable is equal to zero). Therefore, the correct answer is A) slope; intercept.

Question 12

The Kappa Iota Sigma Fraternity polled its members on the weekend party theme. The_ vote was as follows: six for toga, four for hayride, eight for luau, and two for masquerade.
Display the vote count in a Pareto chart.

Accepted Answer

The answer of The Kappa Iota Sigma Fraternity polled its...

Question 13

Which of the following cumulative frequency distribution corresponds to the given frequency distribution? $\begin{array}{r|c}
\text { Weight (oz) } & \begin{array}{l}
\text { Number } \
\text { of Stones }
\end{array} \
\hline 1.2-1.6 & 5 \
1.7-2.1 & 2 \
2.2-2.6 & 5 \
2.7-3.1 & 5 \
3.2-3.6 & 13
\end{array}$

Accepted Answer

The cumulative frequency is calculated by adding each frequency from the previous intervals. The correct cumulative frequencies are: 5, 7, 12, 17, and 30, which matches option C.

Question 14

A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people
Aged between 25 and 40 years. The blood pressure readings (in mm Hg)were given to the
Nearest whole number. What class width was used to construct the relative frequency
Distribution? Systolic Blood Pressure for People Aged 25 - 40 Years

Accepted Answer

The answer of A nurse measured the blood pressure of...

Question 15

The following data show the number of laps run by each participant in a marathon._ $\begin{array} { l l l l l l l l l l l l } 46 & 65 & 55 & 43 & 51 & 48 & 57 & 30 & 43 & 49 & 32 & 56 \end{array}$
Which of these choices display the correct stemplot?

Accepted Answer

The correct stemplot should have the stem as the tens digit and the leaf as the ones digit. Choice A follows this rule, while Choice B does not.

Question 16

The following frequency distribution analyzes the scores on a math test. Find the class boundaries of scores interval 90-99. $$\begin{array} { c c } 
\hline \text { Scores } & \text { Number of Students } \
\hline 50 - 59 & 2 \
60 - 69 & 4 \
70 - 79 & 6 \
80 - 89 & 15 \
90 - 99 & 5 \
\hline
\end{array}$$

Accepted Answer

The class boundaries are the lower and upper limits of each class interval. The lower boundary of a class interval is the midpoint of the previous interval, and the upper boundary is the midpoint of the current interval. For the interval 90-99, the lower boundary is 89.5 and the upper boundary is 99.5.

Question 17

Analysis of the data from 25 mothers indicates that an infant's birth weight (g), y , can be estimated by a mother's weight  (kg), x , using the regression equation  y=31 x+1501 .  For every $\underline{\quad\quad}$
  (kg) increase in a mother's weight, the infant's birth weight increases by $\underline{\quad\quad}$
 g.

Accepted Answer

The regression equation y = 31x + 1501 shows that for every 1 kg increase in a mother's weight (x), the infant's birth weight (y) increases by 31 g.

Question 18

The scatterplot below displays the amount of nitrous oxide (NO)explained by the amount of_ carbon monoxide (CO)emissions in million metric tons over a ten year period in the United
States. Select the choice that best describes any relationship between the variables.

Accepted Answer

The answer of The scatterplot below displays the amount of...

Question 19

Identify the cumulative frequency distribution that corresponds to the given frequency_ distribution. $\begin{array}{r|c}
\text { Speed } & \begin{array}{c}
\text { Number } \
\text { of Cars }
\end{array} \
\hline 0-29 & 4 \
30-59 & 16 \
60-89 & 60 \
90-119 & 20
\end{array}$

Accepted Answer

Option A correctly adds the frequencies cumulatively: 4 cars are less than 30, adding 16 more makes 20 less than 60, adding 60 more makes 80 less than 90, and adding the final 20 makes 100 less than 120.

Question 20

Which choice displays the best graphic display of the amount of nitrous oxide (NO)1)____________ explained by the amount of carbon monoxide (CO)emissions in million metric tons over a
Ten year period in the United States? The data set is below: $$\begin{array} { r | c c c c c c c c } 
\text { Athlete } & \mathbf { A } & \mathbf { B } & \mathbf { C } & \mathbf { D } & \mathbf { E } & \mathbf { F } & \mathbf { G } & \mathbf { H } \
\hline \text { Before } & 115.2 & 114 & 116.4 & 119.8 & 110.9 & 112.4 & 111.5 & 117.3 \
\hline \text { After } & 112.9 & 112.7 & 114 & 120.6 & 109.1 & 109.1 & 107.9 & 113.4
\end{array}$$

Accepted Answer

The answer of Which choice displays the best graphic display...

Quiz 2: Exploring Data With Tables and Graphs

Analysis of the data from 25 mothers indicates that an infant's birth weight $( \mathrm { g } ) , y$ can be estimated by a mother's weight (kg) , x , using the regression equation $y = 31 x + 1501$ If a mother's weight is 70 kg the infant's birth weight can be estimated as _________ $g .$

$\begin{array} { c c c c c c c c c } x & 0.51 & 0.02 & 0.14 & 0.29 & 0.34 & 0.8 & 0.47 & 0.71 \\y & 0.31 & 0.46 & - 0.12 & 0.34 & - 0.05 & 0.8 & 0.35 & 0.47\end{array}$ Which of these choices display the correct scatterplot?

A store manager counts the number of customers who make a purchase in his store each_ day. The data are as follows. $\begin{array} { l l l l l l l l l l } 10 & 11 & 8 & 14 & 7 & 10 & 10 & 11 & 8 & 7 \end{array}$ Which of these choices display the correct dotplot?

The histogram below represents the number of television sets per household for a sample of U.S. households. What is the sample size? Number of Television Sets Per U.S. Household

The two key parts of a regression equation involve the and the y-.

The Kappa Iota Sigma Fraternity polled its members on the weekend party theme. The_ vote was as follows: six for toga, four for hayride, eight for luau, and two for masquerade. Display the vote count in a Pareto chart.

The following data show the number of laps run by each participant in a marathon._ $\begin{array} { l l l l l l l l l l l l } 46 & 65 & 55 & 43 & 51 & 48 & 57 & 30 & 43 & 49 & 32 & 56 \end{array}$ Which of these choices display the correct stemplot?

The scatterplot below displays the amount of nitrous oxide (NO) explained by the amount of_ carbon monoxide (CO) emissions in million metric tons over a ten year period in the United States. Select the choice that best describes any relationship between the variables.

Identify the cumulative frequency distribution that corresponds to the given frequency_ distribution. $\begin{array}{r|c}\text { Speed } & \begin{array}{c}\text { Number } \\\text { of Cars }\end{array} \\\hline 0-29 & 4 \\30-59 & 16 \\60-89 & 60 \\90-119 & 20\end{array}$