Question 1

Compute the range for the set of data.
-4, 9, 6, 1, 7, 13, 7, 9, 4

Accepted Answer

A)  6.7 
B)  13 
C)  14 
D)  12 
A)  6.7 
B)  13 
C)  14 
D)  12 D

Question 2

Many firms use on-the-job training to teach their employees new software. Suppose you work in the personnel department of a firm that just finished training a group of its employees in new software, 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 73 and 3, respectively, and the distribution of scores is mound-shaped and symmetric. Suppose the trainee in question received a score of 68. Compute the trainee's z-score.

Accepted Answer

A)  z = 1.67 
B)  z = 0.89 
C)  z = -0.89 
D)  z = -1.67 
A)  z = 1.67 
B)  z = 0.89 
C)  z = -0.89 
D)  z = -1.67 D

Question 3

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 290 with a standard deviation of 40 on a standardized test. Assuming a bell-shaped distribution, what percentage of scores exceeded 210?

Accepted Answer

A)  approximately 95% 
B)  approximately 97.5% 
C)  approximately 2.5% 
D)  approximately 84% 
A)  approximately 95% 
B)  approximately 97.5% 
C)  approximately 2.5% 
D)  approximately 84% B

Question 4

Solar energy is considered by many to be the energy of the future. A recent survey was taken 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 $94 and a standard deviation of $12. If the distribution can be considered bell shaped, what percentage of homes will have a monthly utility bill of more than $82?

Accepted Answer

A)  approximately 16% 
B)  approximately 95% 
C)  approximately 32% 
D)  approximately 84% 
A)  approximately 16% 
B)  approximately 95% 
C)  approximately 32% 
D)  approximately 84%

Question 5

The following data represent a random sample of 15 complaints registered with the customer service department of a store. Determine the mode complaint.

Accepted Answer

A)  excessive waiting time 
B)  no mode 
C)  defective product 
D)  rude personnel 
A)  excessive waiting time 
B)  no mode 
C)  defective product 
D)  rude personnel

Question 6

A severe drought affected several western states for 3 years. A Christmas tree farmer is worried about the drought's effect on the size of his trees. To decide whether the growth of the trees has been retarded, the farmer decides to take a sample of the heights of 25 trees and obtains the following results (recorded in inches):   Which measure of central tendency would be considered the best measure to use in this problem?

Accepted Answer

A)  range 
B)  median 
C)  mode 
D)  mean 
A)  range 
B)  median 
C)  mode 
D)  mean

Question 7

Find the sample standard deviation.
-24, 90, 25, 73, 41, 21, 25, 22, 21

Accepted Answer

A)  530.6 
B)  23.0 
C)  589.6 
D)  25.8 
A)  530.6 
B)  23.0 
C)  589.6 
D)  25.8

Question 8

SAS was used to compare the high school dropout rates for the 30 school districts in one city in 2010 and 2012. The box plots generated for these dropout rates are shown below.Compare the center of the distributions and the variation of the distributions for the two years.

Accepted Answer

A)  Dropout rates had a higher average with more variability in 2010 than in 2012. 
B)  Dropout rates had a higher average with less variability in 2010 than in 2012. 
C)  Dropout rates had a lower average with less variability in 2010 than in 2012. 
D)  Dropout rates had a lower average with more variability in 2010 than in 2012. 
A)  Dropout rates had a higher average with more variability in 2010 than in 2012. 
B)  Dropout rates had a higher average with less variability in 2010 than in 2012. 
C)  Dropout rates had a lower average with less variability in 2010 than in 2012. 
D)  Dropout rates had a lower average with more variability in 2010 than in 2012.

Question 9

A 1-pound bag of peanuts contains 430 peanuts. The distribution of weights in grams of the peanuts is given below . What is the mean weight of a peanut?

Accepted Answer

A)  0.965 g 
B)  1.059 g 
C)  1.029 g 
D)  1.088 g 
A)  0.965 g 
B)  1.059 g 
C)  1.029 g 
D)  1.088 g

Question 10

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 260 and a standard deviation of 30 on a standardized test. Find and interpret the z-score of a student who scored 500 on the standardized test.

Accepted Answer

The z-score is z = @#IMG-DLM& .For a sco

Question 11

Compute the range for the set of data.
-10, 11, 12, 13, 14

Accepted Answer

A)  4 
B)  0.8 
C)  14 
D)  10 
A)  4 
B)  0.8 
C)  14 
D)  10

Question 12

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. In the first 6 months of 1988, advertisers spent $1.1 billion. A recent article listed the top 10 leading spenders (in millions of dollars):   Calculate the median.

Accepted Answer

A)  39.67 million dollars 
B)  28.90 million dollars 
C)  51.50 million dollars 
D)  5.38 million dollars 
A)  39.67 million dollars 
B)  28.90 million dollars 
C)  51.50 million dollars 
D)  5.38 million dollars

Question 13

Solar energy is considered by many to be the energy of the future. A recent survey was taken 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 $134 and a standard deviation of $15. Assuming the distribution is mound-shaped and symmetric, would you expect to see a 3-bedroom house using gas or electric energy with a monthly utility bill of $216.50? Explain.

Accepted Answer

The z-score for the value $216.50 is:z =

Question 14

A 1-pound bag of peanuts contained 430 peanuts. The distribution of weights (in grams) of the peanuts is given below . What is the sample standard deviation of the weight of a peanut?

Accepted Answer

A)  0.002 g 
B)  0.045 g 
C)  0.209 g 
D)  0.000004 g 
A)  0.002 g 
B)  0.045 g 
C)  0.209 g 
D)  0.000004 g

Question 15

The book cost (in dollars) for one semester's books are given below for a sample of five college students. Calculate the sample variance of the book costs.275, 100, 380, 480, 260

Accepted Answer

A)  380.00 
B)  142.32 
C)  20,255.00 
D)  299.00 
A)  380.00 
B)  142.32 
C)  20,255.00 
D)  299.00

Question 16

Health care issues are receiving much attention in both academic and political arenas. A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for government health care but who have no private health insurance. The ages of 25 uninsured senior citizens were as follows:   Find   of the data.

Accepted Answer

A)  66.5 
B)  64.5 
C)  81.5 
D)  65.5 
A)  66.5 
B)  64.5 
C)  81.5 
D)  65.5

Question 17

Many firms use on-the-job training to teach their employees new software. Suppose you work in the personnel department of a firm that just finished training a group of its employees in new software, 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 of the test scores is 79. Additional information indicated that the median of the test scores was 89. What type of distribution most likely describes the shape of the test scores?

Accepted Answer

A)  unable to determine with the information given 
B)  skewed to the left 
C)  symmetric 
D)  skewed to the right 
A)  unable to determine with the information given 
B)  skewed to the left 
C)  symmetric 
D)  skewed to the right

Question 18

Find the sample standard deviation.
-10, 19, 13, 15, 11, 13, 14, 8, 5, 19

Accepted Answer

A)  4.1 
B)  1.4 
C)  3.9 
D)  4.4 
A)  4.1 
B)  1.4 
C)  3.9 
D)  4.4

Question 19

The selling prices of mutual funds change daily. In order to study these changes, a sample of mutual funds was examined and the daily changes in price are listed below.0.05, 0.00, -0.03, -0.01, 0.18, 0.00, 0.02, 0.29, 0.00, -0.07, 0.10, 0.07, 0.03 Determine the lower and upper fences. Are there any outliers according to this criterion?

Accepted Answer

lower fence = -0.14;

Question 20

Find the sample standard deviation.
-14, 14, 14, 17, 20, 20, 20

Accepted Answer

A)  7.7 
B)  9.0 
C)  3 
D)  2.8 
A)  7.7 
B)  9.0 
C)  3 
D)  2.8

Compute the range for the set of data. -4, 9, 6, 1, 7, 13, 7, 9, 4

The following data represent a random sample of 15 complaints registered with the customer service department of a store. Determine the mode complaint.

Find the sample standard deviation. -24, 90, 25, 73, 41, 21, 25, 22, 21

SAS was used to compare the high school dropout rates for the 30 school districts in one city in 2010 and 2012. The box plots generated for these dropout rates are shown below.Compare the center of the distributions and the variation of the distributions for the two years.

A 1-pound bag of peanuts contains 430 peanuts. The distribution of weights in grams of the peanuts is given below . What is the mean weight of a peanut?

Compute the range for the set of data. -10, 11, 12, 13, 14

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. In the first 6 months of 1988, advertisers spent $1.1 billion. A recent article listed the top 10 leading spenders (in millions of dollars): Calculate the median.

A 1-pound bag of peanuts contained 430 peanuts. The distribution of weights (in grams) of the peanuts is given below . What is the sample standard deviation of the weight of a peanut?

The book cost (in dollars) for one semester's books are given below for a sample of five college students. Calculate the sample variance of the book costs.275, 100, 380, 480, 260

Find the sample standard deviation. -10, 19, 13, 15, 11, 13, 14, 8, 5, 19

Find the sample standard deviation. -14, 14, 14, 17, 20, 20, 20

Data Collection

Organizing and Summarizing Data

Describing the Relation Between Two Variables

Probability

Discrete Probability Distributions

The Normal Probability Distributions

Sampling Distributions

Estimating the Value of a Parameter Using Confidence Intervals

Hypothesis Tests Regarding a Parameter

Inference on Two Samples

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

Filters

Exam 3: Numerically Summarizing Data

Compute the range for the set of data. -4, 9, 6, 1, 7, 13, 7, 9, 4

The following data represent a random sample of 15 complaints registered with the customer service department of a store. Determine the mode complaint.

Find the sample standard deviation. -24, 90, 25, 73, 41, 21, 25, 22, 21

SAS was used to compare the high school dropout rates for the 30 school districts in one city in 2010 and 2012. The box plots generated for these dropout rates are shown below.Compare the center of the distributions and the variation of the distributions for the two years.

A 1-pound bag of peanuts contains 430 peanuts. The distribution of weights in grams of the peanuts is given below . What is the mean weight of a peanut?

Compute the range for the set of data. -10, 11, 12, 13, 14

Each year advertisers spend billions of dollars purchasing commercial time on network sports television. In the first 6 months of 1988, advertisers spent $1.1 billion. A recent article listed the top 10 leading spenders (in millions of dollars): Calculate the median.

A 1-pound bag of peanuts contained 430 peanuts. The distribution of weights (in grams) of the peanuts is given below . What is the sample standard deviation of the weight of a peanut?

The book cost (in dollars) for one semester's books are given below for a sample of five college students. Calculate the sample variance of the book costs.275, 100, 380, 480, 260

Find the sample standard deviation. -10, 19, 13, 15, 11, 13, 14, 8, 5, 19

Find the sample standard deviation. -14, 14, 14, 17, 20, 20, 20

Data Collection

Organizing and Summarizing Data

Describing the Relation Between Two Variables

Probability

Discrete Probability Distributions

The Normal Probability Distributions

Sampling Distributions

Estimating the Value of a Parameter Using Confidence Intervals

Hypothesis Tests Regarding a Parameter

Inference on Two Samples

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

Filters