Question 1

Scatterplots are useful for both qualitative and quantitative data.

Accepted Answer

A) True 
 B)False

Question 2

Box plots are used to detect outliers in qualitative data sets, while z-scores are used to detect outliers in quantitative data sets.

Accepted Answer

A) True 
 B)False

Question 3

The speeds of the fastballs thrown by major league baseball pitchers were measured by radar gun. The mean speed was 86 miles per hour. The standard deviation of the speeds was 5 mph. Which of the following speeds would be classified as an outlier?

Accepted Answer

A)  81 mph 
B)  94 mph 
C)  76 mph 
D)  102 mph 
A)  81 mph 
B)  94 mph 
C)  76 mph 
D)  102 mph

Question 4

For the distribution drawn here, identify the mean, median, and mode.

Accepted Answer

A)  $A =$ median, $B =$ mode, $C =$ mean 
B)  $A =$ mean, $B =$ mode, $C =$ median 
C)  $\mathrm { A } =$ mode, $\mathrm { B } =$ median, $\mathrm { C } =$ mean 
D)  $\mathrm { A } =$ mode, $\mathrm { B } =$ mean, $\mathrm { C } =$ median 
A)  $A =$ median, $B =$ mode, $C =$ mean 
B)  $A =$ mean, $B =$ mode, $C =$ median 
C)  $\mathrm { A } =$ mode, $\mathrm { B } =$ median, $\mathrm { C } =$ mean 
D)  $\mathrm { A } =$ mode, $\mathrm { B } =$ mean, $\mathrm { C } =$ median

Question 5

A recent survey was conducted to compare the cost of solar energy to the cost of gas or electric energy. Results of the survey revealed that the distribution of the amount of the monthly utility bill of a 3-bedroom house using gas or electric energy had a mean of $100 and a standard deviation of $14. Three solar homes reported monthly utility bills of $51, $48, and $56. Which of the following statements is true?

Accepted Answer

A)  The utility bills for homes using solar power are about the same as those for homes using only gas and electricity. 
B)  Homes using solar power may have lower utility bills than homes using only gas and electricity. 
C)  Homes using solar power may actually have higher utility bills than homes using only gas and electricity. 
D)  Homes using solar power always have lower utility bills than homes using only gas and electricity. 
A)  The utility bills for homes using solar power are about the same as those for homes using only gas and electricity. 
B)  Homes using solar power may have lower utility bills than homes using only gas and electricity. 
C)  Homes using solar power may actually have higher utility bills than homes using only gas and electricity. 
D)  Homes using solar power always have lower utility bills than homes using only gas and electricity.

Question 6

If a z-score is 0 or near 0, the measurement is located at or near the mean.

Accepted Answer

A) True 
 B)False

Question 7

By law, a box of cereal labeled as containing 24 ounces must contain at least 24 ounces of cereal. The machine filling the boxes produces a distribution of fill weights that is mound-shaped and symmetric, with a mean equal to the setting on the machine and with a standard deviation equal to 0.02 ounce. To ensure that most of the boxes contain at least 24 ounces, the machine is set so that the mean fill per box is 24.06 ounces. What percentage of the boxes do, in fact, contain at least 24 ounces?

Accepted Answer

The value of 24 ounces falls three stand

Question 8

Which of the graphical techniques below can be used to summarize qualitative data?

Accepted Answer

A)  box plot 
B)  stem-and-leaf plot 
C)  dot plot 
D)  bar graph 
A)  box plot 
B)  stem-and-leaf plot 
C)  dot plot 
D)  bar graph

Question 9

Which of the following statements concerning the box plot and z-score methods for detecting outliers is false?

Accepted Answer

A)  The z-score method uses the mean and standard deviation as a basis for detecting outliers. 
B)  The z-score method is less affected by an extreme observation in the data set. 
C)  The box plot method uses the quartiles as a basis for detecting outliers. 
D)  The box plot method is less affected by an extreme observation in the data set. 
A)  The z-score method uses the mean and standard deviation as a basis for detecting outliers. 
B)  The z-score method is less affected by an extreme observation in the data set. 
C)  The box plot method uses the quartiles as a basis for detecting outliers. 
D)  The box plot method is less affected by an extreme observation in the data set.

Question 10

The box plot shown below displays the amount of soda that was poured by a filling machine into 12-ounce soda cans at a local bottling company.  
 Based on the box plot, what shape do you believe the distribution of the data to have?

Accepted Answer

A)  skewed to the right 
B)  approximately symmetric 
C)  skewed to the left 
D)  skewed to the center 
A)  skewed to the right 
B)  approximately symmetric 
C)  skewed to the left 
D)  skewed to the center

Question 11

Which measures variability about the mean, the range or the standard deviation?

Accepted Answer

The answer of Which measures variability about the mean, the...

Question 12

In an eye color study, 25 out of 50 people in the sample had brown eyes. In this situation, what does the number .50 represent?

Accepted Answer

A)  a class relative frequency 
B)  a class percentage 
C)  a class frequency 
D)  a class 
A)  a class relative frequency 
B)  a class percentage 
C)  a class frequency 
D)  a class

Question 13

Calculate the standard deviation of a sample for which $n = 6 , \sum x ^ { 2 } = 830 , \sum x = 60$

Accepted Answer

A)  46.00 
B)  6.19 
C)  164.00 
D)  6.78 
A)  46.00 
B)  6.19 
C)  164.00 
D)  6.78

Question 14

On a given day, the price of a gallon of milk had a mean price of $2.16 with a standard deviation of $0.07. A particular food store sold milk for $2.09/gallon. Interpret the z-score for this gas station.

Accepted Answer

A)  The milk price of this food store falls 1 standard deviation below the milk gas price of all food stores. 
B)  The milk price of this food store falls 7 standard deviations above the mean milk price of all food stores. 
C)  The milk price of this food store falls 1 standard deviation above the mean milk price of all food stores. 
D)  The milk price of this food store falls 7 standard deviations below the mean milk price of all food stores. 
A)  The milk price of this food store falls 1 standard deviation below the milk gas price of all food stores. 
B)  The milk price of this food store falls 7 standard deviations above the mean milk price of all food stores. 
C)  The milk price of this food store falls 1 standard deviation above the mean milk price of all food stores. 
D)  The milk price of this food store falls 7 standard deviations below the mean milk price of all food stores.

Question 15

A survey was conducted to determine how people feel about the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data is shown below. $$\begin{array} { r | l  l l l l l l l l } 
\text { Stem } & & & & & \
\hline 3 & 1 & 6 & & & & & & \
4 & 0 & 3 & 4 & 7 & 8 & 9 & 9 & 9 \
5 & 0 & 1 & 1 & 2 & 3 & 4 & 5 & \
6 & 1 & 2 & 5 & 6 & 6 & & & \
7 & 1 & 4 & & & & & \
8 & & & & & & & \
9 & 5 & & & & & &
\end{array}$$ What percentage of the respondents rated overall television quality as very good (regarded as ratings of 80 and above)?

Accepted Answer

A)  1% 
B)  5% 
C)  4% 
D)  20% 
A)  1% 
B)  5% 
C)  4% 
D)  20%

Question 16

What is a time series plot?

Accepted Answer

A scatterplot with the measure

Question 17

What number is missing from the table? $$\begin{array} { | c | c | c | } 
\hline \begin{array} { c } 
\text { Grades } \
\text { on Test }
\end{array} & \text { Frequency } & \begin{array} { c } 
\text { Relative } \
\text { Frequency }
\end{array} \
\hline \text { A } & 6 & .24 \
\hline \text { B } & 7 & \
\hline \text { C } & 9 & .36 \
\hline \text { D } & 2 & .08 \
\hline \text { F } & 1 & .04 \
\hline
\end{array}$$

Accepted Answer

A)  .70 
B)  .07 
C)  .72 
D)  .28 
A)  .70 
B)  .07 
C)  .72 
D)  .28

Question 18

One of the questions posed to a sample of 286 incoming freshmen at a large public university was, "Do you have any tattoos?" Their responses are shown below in the pie chart. Please note that the values shown represent the number of responses in each category.   Based on the responses shown in the pie chart, what percentage of the freshmen responded with
"Yes?"

Accepted Answer

A)  76 
B)  26.6% 
C)  76% 
D)  73.4% 
A)  76 
B)  26.6% 
C)  76% 
D)  73.4%

Question 19

The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. The mean expenditure was calculated to be $500 and the median expenditure was calculated to be $425. Which of the following interpretations of the mean is correct?

Accepted Answer

A)  50% of the students sampled had textbook costs that were less than $500 
B)  The average of the textbook costs sampled was $500 
C)  50% of the students sampled had textbook costs equal to $500 
D)  The most frequently occurring textbook cost in the sample was $500 
A)  50% of the students sampled had textbook costs that were less than $500 
B)  The average of the textbook costs sampled was $500 
C)  50% of the students sampled had textbook costs equal to $500 
D)  The most frequently occurring textbook cost in the sample was $500

Question 20

Explain how stretching the vertical axis of a histogram can be misleading.

Accepted Answer

Stretching the vertical axis m

Scatterplots are useful for both qualitative and quantitative data.

Box plots are used to detect outliers in qualitative data sets, while z-scores are used to detect outliers in quantitative data sets.

The speeds of the fastballs thrown by major league baseball pitchers were measured by radar gun. The mean speed was 86 miles per hour. The standard deviation of the speeds was 5 mph. Which of the following speeds would be classified as an outlier?

For the distribution drawn here, identify the mean, median, and mode.

If a z-score is 0 or near 0, the measurement is located at or near the mean.

Which of the graphical techniques below can be used to summarize qualitative data?

Which of the following statements concerning the box plot and z-score methods for detecting outliers is false?

The box plot shown below displays the amount of soda that was poured by a filling machine into 12-ounce soda cans at a local bottling company. Based on the box plot, what shape do you believe the distribution of the data to have?

Which measures variability about the mean, the range or the standard deviation?

In an eye color study, 25 out of 50 people in the sample had brown eyes. In this situation, what does the number .50 represent?

Calculate the standard deviation of a sample for which $n = 6 , \sum x ^ { 2 } = 830 , \sum x = 60$

On a given day, the price of a gallon of milk had a mean price of $2.16 with a standard deviation of $0.07. A particular food store sold milk for $2.09/gallon. Interpret the z-score for this gas station.

What is a time series plot?

What number is missing from the table? Grades on Test Frequency Relative Frequency A 6 .24 B 7 C 9 .36 D 2 .08 F 1 .04

The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. The mean expenditure was calculated to be $500 and the median expenditure was calculated to be $425. Which of the following interpretations of the mean is correct?

Explain how stretching the vertical axis of a histogram can be misleading.

Statistics, Data, and Statistical Thinking

Probability

Random Variables and Probability Distributions

Sampling Distributions

Inferences Based on a Single Sample: Estimation With Confidence Intervals

Inferences Based on a Single Sample: 355 Tests of Hypotheses

Inferences Based on Two Samples: Confidence Intervals and Tests of Hypotheses

Design of Experiments and Analysis of Variance

Categorical Data Analysis

Simple Linear Regression

Multiple Regression and Model Building

Methods for Quality Improvement: Statistical Process Control Available on CD

Time Series: Descriptive Analyses, Models, and Forecasting Available on CD

Nonparametric Statistics Available on CD

Filters

Exam 2: Methods for Describing Sets of Data

Scatterplots are useful for both qualitative and quantitative data.

Box plots are used to detect outliers in qualitative data sets, while z-scores are used to detect outliers in quantitative data sets.

The speeds of the fastballs thrown by major league baseball pitchers were measured by radar gun. The mean speed was 86 miles per hour. The standard deviation of the speeds was 5 mph. Which of the following speeds would be classified as an outlier?

For the distribution drawn here, identify the mean, median, and mode.

If a z-score is 0 or near 0, the measurement is located at or near the mean.

Which of the graphical techniques below can be used to summarize qualitative data?

Which of the following statements concerning the box plot and z-score methods for detecting outliers is false?

The box plot shown below displays the amount of soda that was poured by a filling machine into 12-ounce soda cans at a local bottling company. Based on the box plot, what shape do you believe the distribution of the data to have?

Which measures variability about the mean, the range or the standard deviation?

In an eye color study, 25 out of 50 people in the sample had brown eyes. In this situation, what does the number .50 represent?

Calculate the standard deviation of a sample for which n=6,∑x2=830,∑x=60n = 6 , \sum x ^ { 2 } = 830 , \sum x = 60n=6,∑x2=830,∑x=60

On a given day, the price of a gallon of milk had a mean price of $2.16 with a standard deviation of $0.07. A particular food store sold milk for $2.09/gallon. Interpret the z-score for this gas station.

What is a time series plot?

What number is missing from the table? Grades on Test Frequency Relative Frequency A 6 .24 B 7 C 9 .36 D 2 .08 F 1 .04

The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. The mean expenditure was calculated to be $500 and the median expenditure was calculated to be $425. Which of the following interpretations of the mean is correct?

Explain how stretching the vertical axis of a histogram can be misleading.

Statistics, Data, and Statistical Thinking

Probability

Random Variables and Probability Distributions

Sampling Distributions

Inferences Based on a Single Sample: Estimation With Confidence Intervals

Inferences Based on a Single Sample: 355 Tests of Hypotheses

Inferences Based on Two Samples: Confidence Intervals and Tests of Hypotheses

Design of Experiments and Analysis of Variance

Categorical Data Analysis

Simple Linear Regression

Multiple Regression and Model Building

Methods for Quality Improvement: Statistical Process Control Available on CD

Time Series: Descriptive Analyses, Models, and Forecasting Available on CD

Nonparametric Statistics Available on CD

Filters

Calculate the standard deviation of a sample for which $n = 6 , \sum x ^ { 2 } = 830 , \sum x = 60$