Question 1

For a data set with an odd number of observations that have been sorted from smallest to largest values,where is the median located?

Accepted Answer

A) n 
B) n/2 
C) (n + 1)/2 
D) n + 1/2 
A) n 
B) n/2 
C) (n + 1)/2 
D) n + 1/2

Question 2

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 3

What is a disadvantage of the range as a measure of dispersion?

Accepted Answer

A) It is based on only two observations. 
B) It can be distorted by a large mean. 
C) It is not in the same units as the original data. 
D) It has no disadvantage. 
A) It is based on only two observations. 
B) It can be distorted by a large mean. 
C) It is not in the same units as the original data. 
D) It has no disadvantage.

Question 4

For any data set,Chebyshev's theorem estimates the proportion of observations that occurs within k standard deviations of the mean,where k is greater than 1.0.

Accepted Answer

A) True 
 B)False

Question 5

Sometimes,a data set has two values that have the highest and equal frequencies. In this case,the distribution of the data can best be described as ________.

Accepted Answer

A) symmetric 
B) bimodal (having two modes) 
C) positively skewed 
D) negatively skewed 
A) symmetric 
B) bimodal (having two modes) 
C) positively skewed 
D) negatively skewed

Question 6

For the past week,a company's common stock closed with the following prices: $61.5,$62,$61.25,$60.875,and $61.5. What was the price range?

Accepted Answer

A) $1.250 
B) $1.750 
C) $1.125 
D) $1.875 
A) $1.250 
B) $1.750 
C) $1.125 
D) $1.875

Question 7

The net annual sales of a sample of small retail clothing stores were organized into the following relative frequency distribution.   What is the mean net sales (in $ millions)?

Accepted Answer

A) $7.09 
B) $10.09 
C) $8.59 
D) Mean cannot be computed. 
A) $7.09 
B) $10.09 
C) $8.59 
D) Mean cannot be computed.

Question 8

On a finance exam,15 accounting majors had an average grade of 90. On the same exam,7 marketing majors averaged 85,and 10 finance majors averaged 93. What is the weighted mean for all 32 students taking the exam?

Accepted Answer

A) 89.84 
B) 89.33 
C) 89.48 
D) 10.67 
A) 89.84 
B) 89.33 
C) 89.48 
D) 10.67

Question 9

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) 1.072 percent per year. 
C) 7.2 percent per year. 
D) 250 students per year. 
A) 2,500 students per year. 
B) 1.072 percent per year. 
C) 7.2 percent per year. 
D) 250 students per year.

Question 10

During the past six months,a purchasing agent placed the following three orders for coal:   What is the weighted arithmetic mean price per ton?

Accepted Answer

A) $87.25 
B) $72.33 
C) $68.47 
D) $89.18 
A) $87.25 
B) $72.33 
C) $68.47 
D) $89.18

Question 11

A question in a market survey asks for a respondent's favorite car color. Which measure of central location should be used to summarize this question?

Accepted Answer

A) Mode 
B) Median 
C) Mean 
D) Standard deviation 
A) Mode 
B) Median 
C) Mean 
D) Standard deviation

Question 12

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

Accepted Answer

A) µ 
B) s 
C) σ 
D) χ 
A) µ 
B) s 
C) σ 
D) χ

Question 13

What is the relationship between the variance and the standard deviation?

Accepted Answer

A) Variance is the square root of the standard deviation. 
B) Variance is the square of the standard deviation. 
C) Variance is twice the standard deviation. 
D) There is no constant relationship between the variance and the standard deviation. 
A) Variance is the square root of the standard deviation. 
B) Variance is the square of the standard deviation. 
C) Variance is twice the standard deviation. 
D) There is no constant relationship between the variance and the standard deviation.

Question 14

The mode is the value of the observation that appears most frequently.

Accepted Answer

A) True 
 B)False

Question 15

The geometric mean is the nth root of the product of n observations.

Accepted Answer

A) True 
 B)False

Question 16

A disadvantage of using an arithmetic mean to summarize a set of data is that ________.

Accepted Answer

A) the arithmetic mean sometimes has two values 
B) it can be used for interval and ratio data 
C) it is always different from the median 
D) it can be biased by one or two extremely small or large values 
A) the arithmetic mean sometimes has two values 
B) it can be used for interval and ratio data 
C) it is always different from the median 
D) it can be biased by one or two extremely small or large values

Question 17

The variance is the mean of the sum of the squared deviations between each observation and the median.

Accepted Answer

A) True 
 B)False

Question 18

A population consists of all the weights of all defensive tackles on a university's football team. They are Johnson,204 pounds; Patrick,215 pounds; Junior,207 pounds; Kendron,212 pounds; Nicko,214 pounds; and Cochran,208 pounds. What is the population standard deviation (in pounds)?

Accepted Answer

A) About 4 
B) About 16 
C) About 100 
D) About 40 
A) About 4 
B) About 16 
C) About 100 
D) About 40

Question 19

The mean,as a measure of central location,would be inappropriate for which one of the following?

Accepted Answer

A) Ages of adults at a senior citizen center 
B) Incomes of lawyers 
C) Number of pages in textbooks on statistics 
D) Marital status of college students at a particular university 
A) Ages of adults at a senior citizen center 
B) Incomes of lawyers 
C) Number of pages in textbooks on statistics 
D) Marital status of college students at a particular university

Question 20

According to the Empirical rule,about 95% of the observations lie within plus and minus 2.00 standard deviations.

Accepted Answer

A) True 
 B)False

For a data set with an odd number of observations that have been sorted from smallest to largest values,where is the median located?

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

What is a disadvantage of the range as a measure of dispersion?

For any data set,Chebyshev's theorem estimates the proportion of observations that occurs within k standard deviations of the mean,where k is greater than 1.0.

Sometimes,a data set has two values that have the highest and equal frequencies. In this case,the distribution of the data can best be described as ________.

For the past week,a company's common stock closed with the following prices: $61.5,$62,$61.25,$60.875,and $61.5. What was the price range?

The net annual sales of a sample of small retail clothing stores were organized into the following relative frequency distribution. What is the mean net sales (in $ millions)?

On a finance exam,15 accounting majors had an average grade of 90. On the same exam,7 marketing majors averaged 85,and 10 finance majors averaged 93. What is the weighted mean for all 32 students taking the exam?

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

During the past six months,a purchasing agent placed the following three orders for coal: What is the weighted arithmetic mean price per ton?

A question in a market survey asks for a respondent's favorite car color. Which measure of central location should be used to summarize this question?

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

What is the relationship between the variance and the standard deviation?

The mode is the value of the observation that appears most frequently.

The geometric mean is the n^th root of the product of n observations.

A disadvantage of using an arithmetic mean to summarize a set of data is that ________.

The variance is the mean of the sum of the squared deviations between each observation and the median.

A population consists of all the weights of all defensive tackles on a university's football team. They are Johnson,204 pounds; Patrick,215 pounds; Junior,207 pounds; Kendron,212 pounds; Nicko,214 pounds; and Cochran,208 pounds. What is the population standard deviation (in pounds)?

The mean,as a measure of central location,would be inappropriate for which one of the following?

According to the Empirical rule,about 95% of the observations lie within plus and minus 2.00 standard deviations.

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

Nonparametric Methods: Nominal Level Hypothesis Tests

Nonparametric Methods: Analysis of Ordinal Data

Index Numbers

Time Series and Forecasting

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters

Exam 3: Describing Data: Numerical Measures

For a data set with an odd number of observations that have been sorted from smallest to largest values,where is the median located?

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

What is a disadvantage of the range as a measure of dispersion?

For any data set,Chebyshev's theorem estimates the proportion of observations that occurs within k standard deviations of the mean,where k is greater than 1.0.

Sometimes,a data set has two values that have the highest and equal frequencies. In this case,the distribution of the data can best be described as ________.

For the past week,a company's common stock closed with the following prices: $61.5,$62,$61.25,$60.875,and $61.5. What was the price range?

The net annual sales of a sample of small retail clothing stores were organized into the following relative frequency distribution. What is the mean net sales (in $ millions)?

On a finance exam,15 accounting majors had an average grade of 90. On the same exam,7 marketing majors averaged 85,and 10 finance majors averaged 93. What is the weighted mean for all 32 students taking the exam?

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

During the past six months,a purchasing agent placed the following three orders for coal: What is the weighted arithmetic mean price per ton?

A question in a market survey asks for a respondent's favorite car color. Which measure of central location should be used to summarize this question?

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

What is the relationship between the variance and the standard deviation?

The mode is the value of the observation that appears most frequently.

The geometric mean is the nth root of the product of n observations.

A disadvantage of using an arithmetic mean to summarize a set of data is that ________.

The variance is the mean of the sum of the squared deviations between each observation and the median.

A population consists of all the weights of all defensive tackles on a university's football team. They are Johnson,204 pounds; Patrick,215 pounds; Junior,207 pounds; Kendron,212 pounds; Nicko,214 pounds; and Cochran,208 pounds. What is the population standard deviation (in pounds)?

The mean,as a measure of central location,would be inappropriate for which one of the following?

According to the Empirical rule,about 95% of the observations lie within plus and minus 2.00 standard deviations.

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

Nonparametric Methods: Nominal Level Hypothesis Tests

Nonparametric Methods: Analysis of Ordinal Data

Index Numbers

Time Series and Forecasting

Statistical Process Control and Quality Management

An Introduction to Decision Theory

Filters

The geometric mean is the n^th root of the product of n observations.