Question 1

In a statistics class,the following 10 scores were randomly selected: 74,73,77,77,71,68,65,77,67,66. What is the median?

Accepted Answer

A) 71.5 
B) 72.0 
C) 77.0 
D) 71.0 
E) 73.0 
A) 71.5 
B) 72.0 
C) 77.0 
D) 71.0 
E) 73.0

Question 2

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000
What is the IQR?

Accepted Answer

A) 681 
B) 454 
C) 1362 
D) 255 
E) 6120 
A) 681 
B) 454 
C) 1362 
D) 255 
E) 6120

Question 3

In a statistics class,10 scores were randomly selected,with the following results: 74,73,77,77,71,68,65,77,67,66
What is the 10th percentile?

Accepted Answer

A) 65.5 
B) 67.3 
C) 66.75 
D) 73.85 
E) 77.0 
A) 65.5 
B) 67.3 
C) 66.75 
D) 73.85 
E) 77.0

Question 4

Find the z-score for an IQ test score of 142 when the mean is 100 and the standard deviation is 15.

Accepted Answer

A) 42 
B) 2.8 
C) 18.78 
D) 1.27 
E) -2.8 
A) 42 
B) 2.8 
C) 18.78 
D) 1.27 
E) -2.8

Question 5

If there are 7 classes in a frequency distribution,then the fourth class will always contain the median.

Accepted Answer

A) True 
 B)False

Question 6

A measurement located outside the upper limits of a box-and-whiskers display is ___________.

Accepted Answer

A) Always in the first quartile 
B) An outlier 
C) Always the largest value in the data set 
D) Within the lower limits 
A) Always in the first quartile 
B) An outlier 
C) Always the largest value in the data set 
D) Within the lower limits

Question 7

Researchers wish to study fuel consumption rates based on speed.The data from the test car at 10 speeds are below:   It can be shown that for these data:   Calculate b1.

Accepted Answer

Question 8

In a study of employee stock ownership plans,data were collected at seven companies on satisfaction with the plan and the amount of organization commitment.   It can be shown that for these data:   Calculate b1.

Accepted Answer

Question 9

The measurement in a sample or a population that occurs most frequently is the ___________.

Accepted Answer

A) Mode 
B) Mean 
C) Median 
D) Outlier 
E) Average 
A) Mode 
B) Mean 
C) Median 
D) Outlier 
E) Average

Question 10

The average life of Canadian women is 73.75 years,and the standard deviation of the life expectancy of Canadian women is 6.5 years.Based on Chebyshev's Theorem,determine the upper and lower bounds on the average life expectancy of Canadian women such that at least 90 percent of the population is included.

Accepted Answer

A) [12.09 135.41] 
B) [8.75 138.75] 
C) [53.20 94.30] 
D) [66.38 81.13] 
E) [67.25 80.25] 
A) [12.09 135.41] 
B) [8.75 138.75] 
C) [53.20 94.30] 
D) [66.38 81.13] 
E) [67.25 80.25]

Question 11

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000
What is the third quartile?

Accepted Answer

A) $1,446.50 
B) $2,617.00 
C) $3,415.75 
D) $3,449.00 
E) $4,212.00 
A) $1,446.50 
B) $2,617.00 
C) $3,415.75 
D) $3,449.00 
E) $4,212.00

Question 12

Which percentile describes the first quartile,Q1?

Accepted Answer

A) 25th 
B) 50th 
C) 75th 
D) 100th 
A) 25th 
B) 50th 
C) 75th 
D) 100th

Question 13

In a study of the factors that affect success in economics,data were collected for 8 business students.Scores on a calculus placement test are given with economics final exam scores.The data are below:   It can be shown that for these data:   140.75.
Calculate b1.

Accepted Answer

Question 14

The pth percentile is a value such that (100 - p)percent of the measurements fall at or below the value.

Accepted Answer

A) True 
 B)False

Question 15

A company CEO asked the marketing research department to find the average age of consumers who bought the most profitable product made by the company.From survey data gathered two years ago,the researchers found the following table.Calculate the average age to give to the CEO.

Accepted Answer

The answer of A company CEO asked the marketing research...

Question 16

Personnel managers usually want to know where a job applicant ranked in his or her graduating class.With a grade point average of 3.83,Michelle Robinson graduated above the 93rd percentile of her graduating class.What is the percentile rank of a student whose GPA was the median GPA?

Accepted Answer

A) 25th 
B) 50th 
C) 75th 
D) 10th 
E) 93rd 
A) 25th 
B) 50th 
C) 75th 
D) 10th 
E) 93rd

Question 17

Range is a better measure of variation than standard deviation.

Accepted Answer

A) True 
 B)False

Question 18

In a statistics class,the following 10 scores were randomly selected: 74,73,77,77,71,68,65,77,67,66. What is the mean?

Accepted Answer

A) 71.5 
B) 72.0 
C) 77.0 
D) 71.0 
E) 73.0 
A) 71.5 
B) 72.0 
C) 77.0 
D) 71.0 
E) 73.0

Question 19

A normal population has 99.73 percent of the population measurements within __________ standard deviations of the mean.

Accepted Answer

A) One 
B) Two 
C) Three 
D) Four 
A) One 
B) Two 
C) Three 
D) Four

Question 20

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378,361,350,375,200,391,375,368,321
What is the standard deviation?

Accepted Answer

A) 342.43 
B) 3424.3 
C) 58.5 
D) 191 
E) 10,609 
A) 342.43 
B) 3424.3 
C) 58.5 
D) 191 
E) 10,609

In a statistics class,the following 10 scores were randomly selected: 74,73,77,77,71,68,65,77,67,66. What is the median?

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the IQR?

In a statistics class,10 scores were randomly selected,with the following results: 74,73,77,77,71,68,65,77,67,66 What is the 10^th percentile?

Find the z-score for an IQ test score of 142 when the mean is 100 and the standard deviation is 15.

If there are 7 classes in a frequency distribution,then the fourth class will always contain the median.

A measurement located outside the upper limits of a box-and-whiskers display is ___________.

Researchers wish to study fuel consumption rates based on speed.The data from the test car at 10 speeds are below: It can be shown that for these data: Calculate b₁.

In a study of employee stock ownership plans,data were collected at seven companies on satisfaction with the plan and the amount of organization commitment. It can be shown that for these data: Calculate b₁.

The measurement in a sample or a population that occurs most frequently is the ___________.

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the third quartile?

Which percentile describes the first quartile,Q1?

In a study of the factors that affect success in economics,data were collected for 8 business students.Scores on a calculus placement test are given with economics final exam scores.The data are below: It can be shown that for these data: 140.75. Calculate b₁.

The p^th percentile is a value such that (100 - p)percent of the measurements fall at or below the value.

A company CEO asked the marketing research department to find the average age of consumers who bought the most profitable product made by the company.From survey data gathered two years ago,the researchers found the following table.Calculate the average age to give to the CEO.

Personnel managers usually want to know where a job applicant ranked in his or her graduating class.With a grade point average of 3.83,Michelle Robinson graduated above the 93^rd percentile of her graduating class.What is the percentile rank of a student whose GPA was the median GPA?

Range is a better measure of variation than standard deviation.

In a statistics class,the following 10 scores were randomly selected: 74,73,77,77,71,68,65,77,67,66. What is the mean?

A normal population has 99.73 percent of the population measurements within __________ standard deviations of the mean.

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378,361,350,375,200,391,375,368,321 What is the standard deviation?

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Process Improvement Using Control Charts

Filters

Exam 3: Descriptive Statistics: Numerical Methods

In a statistics class,the following 10 scores were randomly selected: 74,73,77,77,71,68,65,77,67,66. What is the median?

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the IQR?

In a statistics class,10 scores were randomly selected,with the following results: 74,73,77,77,71,68,65,77,67,66 What is the 10th percentile?

Find the z-score for an IQ test score of 142 when the mean is 100 and the standard deviation is 15.

If there are 7 classes in a frequency distribution,then the fourth class will always contain the median.

A measurement located outside the upper limits of a box-and-whiskers display is ___________.

Researchers wish to study fuel consumption rates based on speed.The data from the test car at 10 speeds are below: It can be shown that for these data: Calculate b1.

In a study of employee stock ownership plans,data were collected at seven companies on satisfaction with the plan and the amount of organization commitment. It can be shown that for these data: Calculate b1.

The measurement in a sample or a population that occurs most frequently is the ___________.

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the third quartile?

Which percentile describes the first quartile,Q1?

In a study of the factors that affect success in economics,data were collected for 8 business students.Scores on a calculus placement test are given with economics final exam scores.The data are below: It can be shown that for these data: 140.75. Calculate b1.

The pth percentile is a value such that (100 - p)percent of the measurements fall at or below the value.

A company CEO asked the marketing research department to find the average age of consumers who bought the most profitable product made by the company.From survey data gathered two years ago,the researchers found the following table.Calculate the average age to give to the CEO.

Personnel managers usually want to know where a job applicant ranked in his or her graduating class.With a grade point average of 3.83,Michelle Robinson graduated above the 93rd percentile of her graduating class.What is the percentile rank of a student whose GPA was the median GPA?

Range is a better measure of variation than standard deviation.

In a statistics class,the following 10 scores were randomly selected: 74,73,77,77,71,68,65,77,67,66. What is the mean?

A normal population has 99.73 percent of the population measurements within __________ standard deviations of the mean.

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378,361,350,375,200,391,375,368,321 What is the standard deviation?

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Process Improvement Using Control Charts

Filters

In a statistics class,10 scores were randomly selected,with the following results: 74,73,77,77,71,68,65,77,67,66 What is the 10^th percentile?

Researchers wish to study fuel consumption rates based on speed.The data from the test car at 10 speeds are below: It can be shown that for these data: Calculate b₁.

In a study of employee stock ownership plans,data were collected at seven companies on satisfaction with the plan and the amount of organization commitment. It can be shown that for these data: Calculate b₁.

In a study of the factors that affect success in economics,data were collected for 8 business students.Scores on a calculus placement test are given with economics final exam scores.The data are below: It can be shown that for these data: 140.75. Calculate b₁.

The p^th percentile is a value such that (100 - p)percent of the measurements fall at or below the value.

Personnel managers usually want to know where a job applicant ranked in his or her graduating class.With a grade point average of 3.83,Michelle Robinson graduated above the 93^rd percentile of her graduating class.What is the percentile rank of a student whose GPA was the median GPA?