Question 1

Which one of the following is referred to as the population mean?

Accepted Answer

A)  µ 
B)  s 
C)  $\sigma$ 
D)  $\chi$ 
A)  µ 
B)  s 
C)  $\sigma$ 
D)  $\chi$ A

Question 2

A company's human resource department was interested in the average number of years that a person works before retiring. The sample of size 11 follows:   What is the mode? ____________.

Accepted Answer

21

Question 3

A value that is typical or representative of the data is referred to as a measure of central location.

Accepted Answer

A) True 
 B)False  True

Question 4

Which measure of central location is used to determine an average annual percent increase?

Accepted Answer

A)  Arithmetic mean 
B)  Weighted mean 
C)  Mode 
D)  Geometric mean 
A)  Arithmetic mean 
B)  Weighted mean 
C)  Mode 
D)  Geometric mean

Question 5

The number of students at a local university increased from 2,500 students to 5,000 students in 10 years. Based on a geometric mean, the university grew at an average percentage rate of

Accepted Answer

A)  2,500 students per year 
B)  1.071 percent per year 
C)  7.1 percent per year 
D)  250 students per year 
A)  2,500 students per year 
B)  1.071 percent per year 
C)  7.1 percent per year 
D)  250 students per year

Question 6

Rank the measures of dispersion in terms of their relative ease of interpretation from least to most.

Accepted Answer

A)  Mode, median, mean 
B)  Range, mean deviation, variance 
C)  Variance, mean deviation, range 
D)  There is no difference 
A)  Mode, median, mean 
B)  Range, mean deviation, variance 
C)  Variance, mean deviation, range 
D)  There is no difference

Question 7

A sample of assistant professors on the business faculty at state supported institutions in Ohio revealed the mean income to be $72,000 for 9 months with a standard deviation of $3,000. Using Chebyshev's Theorem, what proportion of the faculty earns more than $66,000 but less than $78,000?

Accepted Answer

A)  At least 50% 
B)  At least 25% 
C)  At least 75% 
D)  At least 100% 
A)  At least 50% 
B)  At least 25% 
C)  At least 75% 
D)  At least 100%

Question 8

The weights of a sample of crates ready for shipment to Moscow, Russia are (in kilograms): 103, 97, 101, 106 and 103. What is the mean deviation?

Accepted Answer

A)  0 kg 
B)  6.9 kg 
C)  102.0 kg 
D)  2.4 kg 
E)  9.0 kg 
A)  0 kg 
B)  6.9 kg 
C)  102.0 kg 
D)  2.4 kg 
E)  9.0 kg

Question 9

A purchasing agent for a trucking company is shopping for replacement tires for their trucks from two suppliers. The suppliers' prices are the same. However, Supplier A's tires have an average life of 60,000 miles with a standard deviation of 10,000 miles. Supplier B's tires have an average life of 60,000 miles with a standard deviation of 2,000 miles. Which of the following statements is true?

Accepted Answer

A)  The two distributions of tire life are the same 
B)  On average, Supplier A's tires have a longer life then Supplier B's tires 
C)  The life of Supplier B's tire is more predictable than the life of Supplier A's tires 
D)  The dispersion of Supplier A's tire life is less than the dispersion of Supplier B's tire life 
A)  The two distributions of tire life are the same 
B)  On average, Supplier A's tires have a longer life then Supplier B's tires 
C)  The life of Supplier B's tire is more predictable than the life of Supplier A's tires 
D)  The dispersion of Supplier A's tire life is less than the dispersion of Supplier B's tire life

Question 10

What measure of central location cannot be determined if the distribution has an open-ended class? ____________________

Accepted Answer

The answer of What measure of central location cannot be...

Question 11

Cook County public safety monitors the number of "driving under the influence" arrests and is interested in the distribution of arrests in the month of December over the last 5 years. The data are   What is the sample variance? ___________.

Accepted Answer

The answer of Cook County public safety monitors the number...

Question 12

What is the relationship among the mean, median and mode in a symmetric distribution?

Accepted Answer

A)  They are all equal 
B)  The mean is always the smallest value 
C)  The mean is always the largest value 
D)  The mode is the largest value 
A)  They are all equal 
B)  The mean is always the smallest value 
C)  The mean is always the largest value 
D)  The mode is the largest value

Question 13

The mean deviation is the difference between the mean or the deviations and the arithmetic mean.

Accepted Answer

A) True 
 B)False

Question 14

A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49, $50, $45, $52 and $55. What is the median charge?

Accepted Answer

A)  $47.50 
B)  $51.00 
C)  $52.00 
D)  $55.00 
A)  $47.50 
B)  $51.00 
C)  $52.00 
D)  $55.00

Question 15

What are the similarities and differences between the applications of Chebyshev's Theorem and the Empirical Rule?

Accepted Answer

Both Chebyshev's Theorem and the Empiric

Question 16

The net incomes (in $millions) of a sample of steel fabricators are: $86, $67, $86 and $85. What is the modal net income?

Accepted Answer

A)  $67 
B)  $85 
C)  $85.5 
D)  $86 
A)  $67 
B)  $85 
C)  $85.5 
D)  $86

Question 17

A sample of single persons receiving social security payments revealed these monthly benefits: $826, $699, $1,087, $880, $839 and $965. How many observations are below the median?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  3.5 
A)  0 
B)  1 
C)  2 
D)  3 
E)  3.5

Question 18

On a survey questionnaire, students were asked to indicate their class in college. If there were only four choices from which to choose, which measure(s) of central location would be appropriate to use for the data generated by that questionnaire item?

Accepted Answer

A)  Mean and median 
B)  Mean and mode 
C)  Mode and median 
D)  Mode only 
A)  Mean and median 
B)  Mean and mode 
C)  Mode and median 
D)  Mode only

Question 19

The number of work stoppages in a highly industrialized region for selected months are: 6, 0, 10, 14, 8 and 0. What is the median number of stoppages?

Accepted Answer

A)  0 
B)  6 
C)  7 
D)  8 
E)  3 
A)  0 
B)  6 
C)  7 
D)  8 
E)  3

Question 20

Based on the Empirical Rule, what percent of the observations will lie between plus or minus two standard deviations from the mean?

Accepted Answer

A)  95% 
B)  5% 
C)  68% 
D)  2.5% 
A)  95% 
B)  5% 
C)  68% 
D)  2.5%

Which one of the following is referred to as the population mean?

A company's human resource department was interested in the average number of years that a person works before retiring. The sample of size 11 follows: What is the mode? ____________.

A value that is typical or representative of the data is referred to as a measure of central location.

Which measure of central location is used to determine an average annual percent increase?

The number of students at a local university increased from 2,500 students to 5,000 students in 10 years. Based on a geometric mean, the university grew at an average percentage rate of

Rank the measures of dispersion in terms of their relative ease of interpretation from least to most.

A sample of assistant professors on the business faculty at state supported institutions in Ohio revealed the mean income to be $72,000 for 9 months with a standard deviation of $3,000. Using Chebyshev's Theorem, what proportion of the faculty earns more than $66,000 but less than $78,000?

The weights of a sample of crates ready for shipment to Moscow, Russia are (in kilograms): 103, 97, 101, 106 and 103. What is the mean deviation?

What measure of central location cannot be determined if the distribution has an open-ended class? ____________________

Cook County public safety monitors the number of "driving under the influence" arrests and is interested in the distribution of arrests in the month of December over the last 5 years. The data are What is the sample variance? ___________.

What is the relationship among the mean, median and mode in a symmetric distribution?

The mean deviation is the difference between the mean or the deviations and the arithmetic mean.

A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49, $50, $45, $52 and $55. What is the median charge?

What are the similarities and differences between the applications of Chebyshev's Theorem and the Empirical Rule?

The net incomes (in $millions) of a sample of steel fabricators are: $86, $67, $86 and $85. What is the modal net income?

A sample of single persons receiving social security payments revealed these monthly benefits: $826, $699, $1,087, $880, $839 and $965. How many observations are below the median?

On a survey questionnaire, students were asked to indicate their class in college. If there were only four choices from which to choose, which measure(s) of central location would be appropriate to use for the data generated by that questionnaire item?

The number of work stoppages in a highly industrialized region for selected months are: 6, 0, 10, 14, 8 and 0. What is the median number of stoppages?

Based on the Empirical Rule, what percent of the observations will lie between plus or minus two standard deviations from the mean?

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Correlation and Linear Regression

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

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Exam 3: Describing Data: Numerical Measures

Which one of the following is referred to as the population mean?

A company's human resource department was interested in the average number of years that a person works before retiring. The sample of size 11 follows: What is the mode? ____________.

A value that is typical or representative of the data is referred to as a measure of central location.

Which measure of central location is used to determine an average annual percent increase?

The number of students at a local university increased from 2,500 students to 5,000 students in 10 years. Based on a geometric mean, the university grew at an average percentage rate of

Rank the measures of dispersion in terms of their relative ease of interpretation from least to most.

A sample of assistant professors on the business faculty at state supported institutions in Ohio revealed the mean income to be $72,000 for 9 months with a standard deviation of $3,000. Using Chebyshev's Theorem, what proportion of the faculty earns more than $66,000 but less than $78,000?

The weights of a sample of crates ready for shipment to Moscow, Russia are (in kilograms): 103, 97, 101, 106 and 103. What is the mean deviation?

What measure of central location cannot be determined if the distribution has an open-ended class? ____________________

Cook County public safety monitors the number of "driving under the influence" arrests and is interested in the distribution of arrests in the month of December over the last 5 years. The data are What is the sample variance? ___________.

What is the relationship among the mean, median and mode in a symmetric distribution?

The mean deviation is the difference between the mean or the deviations and the arithmetic mean.

A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49, $50, $45, $52 and $55. What is the median charge?

What are the similarities and differences between the applications of Chebyshev's Theorem and the Empirical Rule?

The net incomes (in $millions) of a sample of steel fabricators are: $86, $67, $86 and $85. What is the modal net income?

A sample of single persons receiving social security payments revealed these monthly benefits: $826, $699, $1,087, $880, $839 and $965. How many observations are below the median?

On a survey questionnaire, students were asked to indicate their class in college. If there were only four choices from which to choose, which measure(s) of central location would be appropriate to use for the data generated by that questionnaire item?

The number of work stoppages in a highly industrialized region for selected months are: 6, 0, 10, 14, 8 and 0. What is the median number of stoppages?

Based on the Empirical Rule, what percent of the observations will lie between plus or minus two standard deviations from the mean?

What Is Statistics

Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation

Describing Data: Displaying and Exploring Data

A Survey of Probability Concepts

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Methods and the Central Limit Theorem

Estimation and Confidence Intervals

One-Sample Tests of Hypothesis

Two-Sample Tests of Hypothesis

Analysis of Variance

Correlation and Linear Regression

Multiple Regression Analysis

Index Numbers

Time Series and Forecasting

Nonparametric Methods: Goodness-Of-Fit Tests

Nonparametric Methods: Analysis of Ranked Data

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters