Question 1

The pie chart shows the classifications of students in a statistics class. What percentage of the class consists of freshman, sophomores, and juniors?

Accepted Answer

A)  44% 
B)  14% 
C)  86% 
D)  54% 
A)  44% 
B)  14% 
C)  86% 
D)  54%

Question 2

A standardized test has a mean score of 500 points with a standard deviation of 100 points. Five students' scores are shown below.

$\text { Adam: } 575 \quad \text { Beth: } 690 \quad \text { Carlos: } 750 \quad \text { Doug: } 280 \quad \text { Ella: } 440$

Which of the students have scores within two standard deviations of the mean?

Accepted Answer

A)  Adam, Beth 
B)  Adam, Beth, Ella 
C)  Adam, Beth, Carlos, Ella 
D)  Carlos, Doug 
A)  Adam, Beth 
B)  Adam, Beth, Ella 
C)  Adam, Beth, Carlos, Ella 
D)  Carlos, Doug

Question 3

Your teacher announces that the scores on a test have a mean of 83 points with a standard deviation of 4 points, so it is reasonable to expect that you scored at least 70 on the test.

Accepted Answer

A) True 
 B)False

Question 4

At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The statistician reported that the mean serve speed of a particular player was 98 miles per hour (mph) and the standard deviation of the serve speeds was 13 mph. Assume that the statistician also gave us the information that the distribution of serve speeds was mound-shaped and symmetric. Find the percentage of serves that were hit faster than 72 mph.

Accepted Answer

We use the Empirical Rule to determine t

Question 5

A small computing center has found that the number of jobs submitted per day to its computers has a distribution that is approximately mound-shaped and symmetric, with a mean of 85 jobs and a standard deviation of 5. Where do we expect approximately 95% of the distribution to fall?

Accepted Answer

A)  between 70 and 100 jobs per day 
B)  between 75 and 95 jobs per day 
C)  between 95 and 100 jobs per day 
D)  between 80 and 90 jobs per day 
A)  between 70 and 100 jobs per day 
B)  between 75 and 95 jobs per day 
C)  between 95 and 100 jobs per day 
D)  between 80 and 90 jobs per day

Question 6

For a given data set, which is typically greater, the range or the standard deviation?

Accepted Answer

The answer of For a given data set, which is...

Question 7

Fill in the blank. One advantage of the __________ is that the actual data values are retained in the graphical summarization of the data.

Accepted Answer

A)  histogram 
B)  stem-and-leaf plot 
C)  pie chart 
A)  histogram 
B)  stem-and-leaf plot 
C)  pie chart

Question 8

A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 470 with a standard deviation of 20 on a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 430 and 510?

Accepted Answer

A)  at least 89% 
B)  at least 75% 
C)  approximately 68% 
D)  approximately 95% 
A)  at least 89% 
B)  at least 75% 
C)  approximately 68% 
D)  approximately 95%

Question 9

The following is a list of 25 measurements: $$\begin{array} { l l l l l l l l l l l } 
12 & 18 & 14 & 17 & 19 & 16 & 14 & 18 & 15 & 17 & 11 \
13 & 14 & 11 & 16 & 18 & 15 & 13 & 17 & 15 & 14 & 19 \
12 & 16 & 17 & & & & & & & &
\end{array}$$ How many of the measurements fall within one standard deviation of the mean?

Accepted Answer

A)  18 
B)  13 
C)  16 
D)  25 
A)  18 
B)  13 
C)  16 
D)  25

Question 10

The box plot shown below was constructed for the amount of soda that was poured by a filling machine into 12-ounce soda cans at a local soda bottling company. 
 
 We see that one soda can received 12.15 ounces of soda on the plot above. Based on the box plot presented, how would you classify this observation?

Accepted Answer

A)  it has a lot of soda 
B)  suspect outlier 
C)  highly suspect outlier 
D)  expected observation 
A)  it has a lot of soda 
B)  suspect outlier 
C)  highly suspect outlier 
D)  expected observation

Question 11

At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The statistician reported that the mean serve speed of a particular player was 100 miles per hour (mph) and the standard deviation of the serve speeds was 15 mph. Using the z-score approach for detecting outliers, which of the following serve speeds would represent outliers in the distribution of the player's serve speeds?

Speeds: 50 mph, 80 mph, and 105 mph

Accepted Answer

A)  50 is the only outlier. 
B)  50, 80, and 105 are all outliers. 
C)  50 and 80 are both outliers, 105 is not. 
D)  None of the three speeds are outliers. 
A)  50 is the only outlier. 
B)  50, 80, and 105 are all outliers. 
C)  50 and 80 are both outliers, 105 is not. 
D)  None of the three speeds are outliers.

Question 12

The scores for a statistics test are as follows: $\begin{array} { l l l l l l l l l l } 75 & 76 & 62 & 77 & 70 & 92 & 61 & 85 & 95 & 89 \end{array}$
$\begin{array} { l l l l l l l l l l } 79 & 67 & 50 & 60 & 85 & 65 & 85 & 73 & 18 & 82 \end{array}$ 
Compute the mean score.

Accepted Answer

A)  63.25 
B)  75 
C)  75.50 
D)  72.30 
A)  63.25 
B)  75 
C)  75.50 
D)  72.30

Question 13

Which of the following is a measure of the variability of a distribution?

Accepted Answer

A)  skewness 
B)  range 
C)  sample size 
D)  median 
A)  skewness 
B)  range 
C)  sample size 
D)  median

Question 14

Explain how using a scale break on the vertical axis of a histogram can be misleading.

Accepted Answer

Using a scale break on the ver

Question 15

A larger standard deviation means greater variability in the data.

Accepted Answer

A) True 
 B)False

Question 16

A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 310 and a standard deviation of 50 on a standardized test. Find and interpret the z-score of a student who scored 490 on the standardized test.

Accepted Answer

The @#LAT-DLM&-score is @#LAT-DLM&.
For a score of

Question 17

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 median is correct?

Accepted Answer

A)  50% of the students sampled had textbook costs equal to $425 
B)  50% of the students sampled had textbook costs that were less than $425 
C)  The average of the textbook costs sampled was $425 
D)  The most frequently occurring textbook cost in the sample was $425 
A)  50% of the students sampled had textbook costs equal to $425 
B)  50% of the students sampled had textbook costs that were less than $425 
C)  The average of the textbook costs sampled was $425 
D)  The most frequently occurring textbook cost in the sample was $425

Question 18

A retail store's customer satisfaction rating is at the 88th percentile. What percentage of retail stores has higher customer satisfaction ratings than this store?

Accepted Answer

The answer of A retail store's customer satisfaction rating is...

Question 19

The data show the total number of medals (gold, silver, and bronze) won by each country winning at least one gold medal in the Winter Olympics. Find the mean, median, and mode of the numbers of medals won by these countries.
 $$\begin{array} { c c c c c c c c c } 
1 & 2 & 3 & 3 & 4 & 9 & 9 & 11 & 11 \
11 & 14 & 14 & 19 & 22 & 23 & 24 & 25 & 29
\end{array}$$

Accepted Answer

The mean is the sum of the num

Question 20

The temperature fluctuated between a low of 73°F and a high of 89°F. Which of the following could be calculated using just this information?

Accepted Answer

A)  variance 
B)  median 
C)  standard deviation 
D)  range 
A)  variance 
B)  median 
C)  standard deviation 
D)  range

The pie chart shows the classifications of students in a statistics class. What percentage of the class consists of freshman, sophomores, and juniors?

Your teacher announces that the scores on a test have a mean of 83 points with a standard deviation of 4 points, so it is reasonable to expect that you scored at least 70 on the test.

A small computing center has found that the number of jobs submitted per day to its computers has a distribution that is approximately mound-shaped and symmetric, with a mean of 85 jobs and a standard deviation of 5. Where do we expect approximately 95% of the distribution to fall?

For a given data set, which is typically greater, the range or the standard deviation?

Fill in the blank. One advantage of the __________ is that the actual data values are retained in the graphical summarization of the data.

The following is a list of 25 measurements: 12 18 14 17 19 16 14 18 15 17 11 13 14 11 16 18 15 13 17 15 14 19 12 16 17 How many of the measurements fall within one standard deviation of the mean?

The scores for a statistics test are as follows: 75 76 62 77 70 92 61 85 95 89 79 67 50 60 85 65 85 73 18 82 Compute the mean score.

Which of the following is a measure of the variability of a distribution?

Explain how using a scale break on the vertical axis of a histogram can be misleading.

A larger standard deviation means greater variability in the data.

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 median is correct?

A retail store's customer satisfaction rating is at the 88th percentile. What percentage of retail stores has higher customer satisfaction ratings than this store?

The data show the total number of medals (gold, silver, and bronze) won by each country winning at least one gold medal in the Winter Olympics. Find the mean, median, and mode of the numbers of medals won by these countries. 1 2 3 3 4 9 9 11 11 11 14 14 19 22 23 24 25 29

The temperature fluctuated between a low of 73°F and a high of 89°F. Which of the following could be calculated using just this information?

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

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Exam 2: Methods for Describing Sets of Data

The pie chart shows the classifications of students in a statistics class. What percentage of the class consists of freshman, sophomores, and juniors?

Your teacher announces that the scores on a test have a mean of 83 points with a standard deviation of 4 points, so it is reasonable to expect that you scored at least 70 on the test.

A small computing center has found that the number of jobs submitted per day to its computers has a distribution that is approximately mound-shaped and symmetric, with a mean of 85 jobs and a standard deviation of 5. Where do we expect approximately 95% of the distribution to fall?

For a given data set, which is typically greater, the range or the standard deviation?

Fill in the blank. One advantage of the __________ is that the actual data values are retained in the graphical summarization of the data.

The following is a list of 25 measurements: 12 18 14 17 19 16 14 18 15 17 11 13 14 11 16 18 15 13 17 15 14 19 12 16 17 How many of the measurements fall within one standard deviation of the mean?

The scores for a statistics test are as follows: 75 76 62 77 70 92 61 85 95 89 79 67 50 60 85 65 85 73 18 82 Compute the mean score.

Which of the following is a measure of the variability of a distribution?

Explain how using a scale break on the vertical axis of a histogram can be misleading.

A larger standard deviation means greater variability in the data.

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 median is correct?

A retail store's customer satisfaction rating is at the 88th percentile. What percentage of retail stores has higher customer satisfaction ratings than this store?

The data show the total number of medals (gold, silver, and bronze) won by each country winning at least one gold medal in the Winter Olympics. Find the mean, median, and mode of the numbers of medals won by these countries. 1 2 3 3 4 9 9 11 11 11 14 14 19 22 23 24 25 29

The temperature fluctuated between a low of 73°F and a high of 89°F. Which of the following could be calculated using just this information?

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