Question 1

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 2

A sample of assistant professors on the business faculty at state-supported institutions in Ohio revealed the mean income to be $72,000 for nine 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 3

Each person who applies for an assembly job at Robert's Electronics is given a mechanical aptitude test. One part of the test involves assembling a plug-in unit based on numbered instructions. A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution.   What is the standard deviation (in minutes)?

Accepted Answer

A) 3.89 
B) 6.01 
C) 8.78 
D) 17.00 
A) 3.89 
B) 6.01 
C) 8.78 
D) 17.00

Question 4

The times (in minutes)that several underwriters took to review applications for similar insurance coverage are 50,230,52,and 57. What is the median length of time required to review an application?

Accepted Answer

A) 54.5 
B) 141.0 
C) 97.25 
D) 109.0 
A) 54.5 
B) 141.0 
C) 97.25 
D) 109.0

Question 5

When computing the arithmetic mean,the smallest value in the data set

Accepted Answer

A) can never be negative. 
B) can never be zero. 
C) can never be less than the mean. 
D) can be any value. 
A) can never be negative. 
B) can never be zero. 
C) can never be less than the mean. 
D) can be any value.

Question 6

Consider two populations with the same mean. Since they have the same mean,then

Accepted Answer

A) their standard deviations must also be the same. 
B) their medians must also be the same. 
C) their modes must also be the same. 
D) none of these is correct. 
A) their standard deviations must also be the same. 
B) their medians must also be the same. 
C) their modes must also be the same. 
D) none of these is correct.

Question 7

The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical,bell-shaped distribution. The arithmetic mean is 14.0 inches,and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts?

Accepted Answer

A) 13.5 and 14.5 inches 
B) 13.0 and 15.0 inches 
C) 13.9 and 14.1 inches 
D) 13.8 and 14.2 inches 
A) 13.5 and 14.5 inches 
B) 13.0 and 15.0 inches 
C) 13.9 and 14.1 inches 
D) 13.8 and 14.2 inches

Question 8

For any data set,which measures of central location have only one value?

Accepted Answer

A) Mode and median 
B) Mode and mean 
C) Mode and standard deviation 
D) Mean and median 
A) Mode and median 
B) Mode and mean 
C) Mode and standard deviation 
D) Mean and median

Question 9

A sample of small bottles and their contents has the following weights (in grams): 4,2,5,4,5,2,and 6. What is the sample variance of bottle weight?

Accepted Answer

A) 6.92 
B) 4.80 
C) 1.96 
D) 2.33 
A) 6.92 
B) 4.80 
C) 1.96 
D) 2.33

Question 10

Extremely high or low scores affect the value of the median.

Accepted Answer

A) True 
 B)False

Question 11

For a set of data arranged or sorted in numerical order,the value of the observation in the center is called the weighted mean.

Accepted Answer

A) True 
 B)False

Question 12

For the most recent seven years,the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,033; 5,652; 6,407; 7,201; 8,719; 11,154; 15,121. What is the annual arithmetic mean number of degrees awarded?

Accepted Answer

A) About 12,240 
B) About 8,327 
C) About 6,217 
D) About 15,962 
A) About 12,240 
B) About 8,327 
C) About 6,217 
D) About 15,962

Question 13

The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5,725 in 1999 to 7,977 in 2009. What is the geometric mean annual percent increase in the number of funds?

Accepted Answer

A) 1.034 
B) 3.37 
C) 39.34 
D) 71.11 
E) 633.5 
A) 1.034 
B) 3.37 
C) 39.34 
D) 71.11 
E) 633.5

Question 14

Assume a student received the following grades for the semester: History,B; Statistics,A; Spanish,C; and English,C. History and English are 5 credit-hour courses,Statistics a 4 credit-hour course,and Spanish is a 3 credit-hour course. If 4 grade points are assigned for an A,3 for a B,and 2 for a C,what is the weighted mean grade for the semester?

Accepted Answer

A) 4.00 
B) 1.96 
C) 2.76 
D) 3.01 
A) 4.00 
B) 1.96 
C) 2.76 
D) 3.01

Question 15

A sample of wires coming off the production line was tested for tensile strength. The statistical results (in PSI)were the following:   According to the Empirical rule,the middle 95% of the wires tested had a tensile strength between approximately what two values?

Accepted Answer

A) 450 and 550 
B) 460 and 540 
C) 420 and 580 
D) 380 and 620 
A) 450 and 550 
B) 460 and 540 
C) 420 and 580 
D) 380 and 620

Question 16

The ages of all the patients in the isolation ward of the hospital are 38,26,13,41,and 22. What is the population variance?

Accepted Answer

A) 106.8 
B) 91.4 
C) 240.3 
D) 42.4 
A) 106.8 
B) 91.4 
C) 240.3 
D) 42.4

Question 17

The variance of a sample of 121 observations equals 441. The standard deviation of the sample equals

Accepted Answer

A) 11. 
B) 21. 
C) 1.91. 
D) 231. 
A) 11. 
B) 21. 
C) 1.91. 
D) 231.

Question 18

The U.S. Federal Aviation Administration reported that passenger revenues on international flights increased from $528 million in 1986 to $5,100 million in 2009. What is the geometric mean annual percent increase in international passenger revenues?

Accepted Answer

A) 10.4 
B) 27.9 
C) 103.6 
D) 9.96 
A) 10.4 
B) 27.9 
C) 103.6 
D) 9.96

Question 19

Variation describes the degree of dispersion in the data.

Accepted Answer

A) True 
 B)False

Question 20

For a data set,half of the observations are always greater than the ________.

Accepted Answer

A) median 
B) mode 
C) mean 
D) standard deviation 
A) median 
B) mode 
C) mean 
D) standard deviation

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

A sample of assistant professors on the business faculty at state-supported institutions in Ohio revealed the mean income to be $72,000 for nine 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 times (in minutes)that several underwriters took to review applications for similar insurance coverage are 50,230,52,and 57. What is the median length of time required to review an application?

When computing the arithmetic mean,the smallest value in the data set

Consider two populations with the same mean. Since they have the same mean,then

The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical,bell-shaped distribution. The arithmetic mean is 14.0 inches,and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts?

For any data set,which measures of central location have only one value?

A sample of small bottles and their contents has the following weights (in grams): 4,2,5,4,5,2,and 6. What is the sample variance of bottle weight?

Extremely high or low scores affect the value of the median.

For a set of data arranged or sorted in numerical order,the value of the observation in the center is called the weighted mean.

For the most recent seven years,the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,033; 5,652; 6,407; 7,201; 8,719; 11,154; 15,121. What is the annual arithmetic mean number of degrees awarded?

The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5,725 in 1999 to 7,977 in 2009. What is the geometric mean annual percent increase in the number of funds?

A sample of wires coming off the production line was tested for tensile strength. The statistical results (in PSI)were the following: According to the Empirical rule,the middle 95% of the wires tested had a tensile strength between approximately what two values?

The ages of all the patients in the isolation ward of the hospital are 38,26,13,41,and 22. What is the population variance?

The variance of a sample of 121 observations equals 441. The standard deviation of the sample equals

The U.S. Federal Aviation Administration reported that passenger revenues on international flights increased from $528 million in 1986 to $5,100 million in 2009. What is the geometric mean annual percent increase in international passenger revenues?

Variation describes the degree of dispersion in the data.

For a data set,half of the observations are always greater than the ________.

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

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Exam 3: Describing Data: Numerical Measures

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

A sample of assistant professors on the business faculty at state-supported institutions in Ohio revealed the mean income to be $72,000 for nine 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 times (in minutes)that several underwriters took to review applications for similar insurance coverage are 50,230,52,and 57. What is the median length of time required to review an application?

When computing the arithmetic mean,the smallest value in the data set

Consider two populations with the same mean. Since they have the same mean,then

The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical,bell-shaped distribution. The arithmetic mean is 14.0 inches,and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts?

For any data set,which measures of central location have only one value?

A sample of small bottles and their contents has the following weights (in grams): 4,2,5,4,5,2,and 6. What is the sample variance of bottle weight?

Extremely high or low scores affect the value of the median.

For a set of data arranged or sorted in numerical order,the value of the observation in the center is called the weighted mean.

For the most recent seven years,the U.S. Department of Education reported the following number of bachelor's degrees awarded in computer science: 4,033; 5,652; 6,407; 7,201; 8,719; 11,154; 15,121. What is the annual arithmetic mean number of degrees awarded?

The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5,725 in 1999 to 7,977 in 2009. What is the geometric mean annual percent increase in the number of funds?

A sample of wires coming off the production line was tested for tensile strength. The statistical results (in PSI)were the following: According to the Empirical rule,the middle 95% of the wires tested had a tensile strength between approximately what two values?

The ages of all the patients in the isolation ward of the hospital are 38,26,13,41,and 22. What is the population variance?

The variance of a sample of 121 observations equals 441. The standard deviation of the sample equals

The U.S. Federal Aviation Administration reported that passenger revenues on international flights increased from $528 million in 1986 to $5,100 million in 2009. What is the geometric mean annual percent increase in international passenger revenues?

Variation describes the degree of dispersion in the data.

For a data set,half of the observations are always greater than the ________.

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