Question 1

The process for finding a percentile is similar to the process for finding the median.

Accepted Answer

A) True 
 B)False

Question 2

An outlier is defined as any observation that falls within the outer fences of a box plot.

Accepted Answer

A) True 
 B)False

Question 3

The following data represent the scores of 50 students on a statistics exam. The mean score is 80.02, and the standard deviation is 11.9. $$\begin{array} { l l l l l l l l l l } 
39 & 51 & 59 & 63 & 66 & 68 & 68 & 69 & 70 & 71 \
71 & 71 & 73 & 74 & 76 & 76 & 76 & 77 & 78 & 79 \
79 & 79 & 79 & 80 & 80 & 82 & 83 & 83 & 83 & 85 \
85 & 86 & 86 & 88 & 88 & 88 & 88 & 89 & 89 & 89 \
90 & 90 & 91 & 91 & 92 & 95 & 96 & 97 & 97 & 98
\end{array}$$ Use the z-score method to identify potential outliers among the scores.

Accepted Answer

The z-score of 39 is -3.46. Si

Question 4

If 25% of your statistics class is sophomores, then in a pie chart representing classifications of the students in your statistics class the slice assigned to sophomores is 90°.

Accepted Answer

A) True 
 B)False

Question 5

The amount spent on textbooks for the fall term was recorded for a sample of five university students - $400, $350, $600, $525, and $450. Calculate the value of the sample standard deviation for the data.

Accepted Answer

A)  $450 
B)  $250 
C)  $98.75 
D)  $99.37 
A)  $450 
B)  $250 
C)  $98.75 
D)  $99.37

Question 6

For large data sets, a stem-and-leaf display is a better choice than a histogram.

Accepted Answer

A) True 
 B)False

Question 7

The amount spent on textbooks for the fall term was recorded for a sample of five university students - $400, $350, $600, $525, and $450. Calculate the value of the sample median for the data.

Accepted Answer

A)  $600 
B)  $450 
C)  $465 
D)  $400 
A)  $600 
B)  $450 
C)  $465 
D)  $400

Question 8

Many firms use on-the-job training to teach their employees computer programming. Suppose you work in the personnel department of a firm that just finished training a group of its employees to program, and you have been requested to review the performance of one of the trainees on the
Final test that was given to all trainees. The mean and standard deviation of the test scores are 84 and 5, respectively, and the distribution of scores is mound-shaped and symmetric. What percentage of test-takers scored better than a trainee who scored 69?

Accepted Answer

A)  approximately 95% 
B)  approximately 97.5% 
C)  approximately 84% 
D)  approximately 100% 
A)  approximately 95% 
B)  approximately 97.5% 
C)  approximately 84% 
D)  approximately 100%

Question 9

An outlier may be caused by accidentally including the height of a six-year-old boy in a set of data representing the heights of 12-year-old boys.

Accepted Answer

A) True 
 B)False

Question 10

A shoe company reports the mode for the shoe sizes of men's shoes is 12. Interpret this result.

Accepted Answer

A)  Most men have shoe sizes between 11 and 13. 
B)  Half of all men's shoe sizes are size 12 
C)  Half of the shoes sold to men are larger than a size 12 
D)  The most frequently occurring shoe size for men is size 12 
A)  Most men have shoe sizes between 11 and 13. 
B)  Half of all men's shoe sizes are size 12 
C)  Half of the shoes sold to men are larger than a size 12 
D)  The most frequently occurring shoe size for men is size 12

Question 11

Find the z-score for the value 88, when the mean is 70 and the standard deviation is 1.
A) $z = 17.00$
B) $z = 18.00$
C) $z = - 1.24$
D) $z = 1.24$

Accepted Answer

The answer of Find the z-score for the value 88,...

Question 12

The range of scores on a statistics test was 42. The lowest score was 57. What was the highest score?

Accepted Answer

A)  70.5 
B)  cannot be determined 
C)  78 
D)  99 
A)  70.5 
B)  cannot be determined 
C)  78 
D)  99

Question 13

What number is missing from the table? $$\begin{array} { | l | c | c | } 
\hline { \begin{array} { c } 
\text { Year in } \
\text { College }
\end{array} } & \text { Frequency } & \begin{array} { c } 
\text { Relative } \
\text { Frequency }
\end{array} \
\hline \text { Freshman } & 600 & .30 \
\hline \text { Sophomore } & 560 & .28 \
\hline \text { Junior } & & .22 \
\hline \text { Senior } & 400 & .20 \
\hline
\end{array}$$

Accepted Answer

A)  520 
B)  440 
C)  480 
D)  220 
A)  520 
B)  440 
C)  480 
D)  220

Question 14

A frequency table displays the proportion of observations falling into each class.

Accepted Answer

A) True 
 B)False

Question 15

According to the empirical rule, z-scores of less than -3 or greater than 3 occur very infrequently for data from a mounded and symmetric distribution

Accepted Answer

A) True 
 B)False

Question 16

Chebyshev's rule applies to qualitative data sets, while the empirical rule applies to quantitative
data sets.

Accepted Answer

A) True 
 B)False

Question 17

Either vertical or horizontal bars can be used when constructing a bar graph.

Accepted Answer

A) True 
 B)False

Question 18

The amount of television viewed by today's youth is of primary concern to Parents Against Watching Television (PAWT). Three hundred parents of elementary school-aged children were asked to estimate the number of hours per week that their child watches television.
The upper quartile for the distribution was given as 20 hours. Interpret this value.

Accepted Answer

75% of the TV viewing times ar

Question 19

If a sample has mean 0 and standard deviation 1, then for every measurement x in the sample the z-score of x is x itself.

Accepted Answer

A) True 
 B)False

Question 20

The bars in a histogram should be arranged by height in descending order from left to right.

Accepted Answer

A) True 
 B)False

The process for finding a percentile is similar to the process for finding the median.

An outlier is defined as any observation that falls within the outer fences of a box plot.

If 25% of your statistics class is sophomores, then in a pie chart representing classifications of the students in your statistics class the slice assigned to sophomores is 90°.

The amount spent on textbooks for the fall term was recorded for a sample of five university students - $400, $350, $600, $525, and $450. Calculate the value of the sample standard deviation for the data.

For large data sets, a stem-and-leaf display is a better choice than a histogram.

The amount spent on textbooks for the fall term was recorded for a sample of five university students - $400, $350, $600, $525, and $450. Calculate the value of the sample median for the data.

An outlier may be caused by accidentally including the height of a six-year-old boy in a set of data representing the heights of 12-year-old boys.

A shoe company reports the mode for the shoe sizes of men's shoes is 12. Interpret this result.

Find the z-score for the value 88, when the mean is 70 and the standard deviation is 1. A) $z = 17.00$ B) $z = 18.00$ C) $z = - 1.24$ D) $z = 1.24$

The range of scores on a statistics test was 42. The lowest score was 57. What was the highest score?

What number is missing from the table? Year in College Frequency Relative Frequency Freshman 600 .30 Sophomore 560 .28 Junior .22 Senior 400 .20

A frequency table displays the proportion of observations falling into each class.

According to the empirical rule, z-scores of less than -3 or greater than 3 occur very infrequently for data from a mounded and symmetric distribution

Chebyshev's rule applies to qualitative data sets, while the empirical rule applies to quantitative data sets.

Either vertical or horizontal bars can be used when constructing a bar graph.

If a sample has mean 0 and standard deviation 1, then for every measurement x in the sample the z-score of x is x itself.

The bars in a histogram should be arranged by height in descending order from left to right.

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

The process for finding a percentile is similar to the process for finding the median.

An outlier is defined as any observation that falls within the outer fences of a box plot.

If 25% of your statistics class is sophomores, then in a pie chart representing classifications of the students in your statistics class the slice assigned to sophomores is 90°.

The amount spent on textbooks for the fall term was recorded for a sample of five university students - $400, $350, $600, $525, and $450. Calculate the value of the sample standard deviation for the data.

For large data sets, a stem-and-leaf display is a better choice than a histogram.

The amount spent on textbooks for the fall term was recorded for a sample of five university students - $400, $350, $600, $525, and $450. Calculate the value of the sample median for the data.

An outlier may be caused by accidentally including the height of a six-year-old boy in a set of data representing the heights of 12-year-old boys.

A shoe company reports the mode for the shoe sizes of men's shoes is 12. Interpret this result.

Find the z-score for the value 88, when the mean is 70 and the standard deviation is 1. A) z=17.00z = 17.00z=17.00 B) z=18.00z = 18.00z=18.00 C) z=−1.24z = - 1.24z=−1.24 D) z=1.24z = 1.24z=1.24

The range of scores on a statistics test was 42. The lowest score was 57. What was the highest score?

What number is missing from the table? Year in College Frequency Relative Frequency Freshman 600 .30 Sophomore 560 .28 Junior .22 Senior 400 .20

A frequency table displays the proportion of observations falling into each class.

According to the empirical rule, z-scores of less than -3 or greater than 3 occur very infrequently for data from a mounded and symmetric distribution

Chebyshev's rule applies to qualitative data sets, while the empirical rule applies to quantitative data sets.

Either vertical or horizontal bars can be used when constructing a bar graph.

If a sample has mean 0 and standard deviation 1, then for every measurement x in the sample the z-score of x is x itself.

The bars in a histogram should be arranged by height in descending order from left to right.

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

Find the z-score for the value 88, when the mean is 70 and the standard deviation is 1. A) $z = 17.00$ B) $z = 18.00$ C) $z = - 1.24$ D) $z = 1.24$