Question 1

Percentiles are values of the variable that divide a set of ranked data into 100 equal subsets.

Accepted Answer

A) True 
 B)False

Question 2

The mean,median,the second quartile,and the 50th percentile are all the same.

Accepted Answer

A) True 
 B)False

Question 3

For a particular sample of 50 scores on a statistics exam,the following results were obtained:
Mean = 78 Median = 80 Mode = 84 Range = 52
First quartile = 68 Third quartile = 94 Standard deviation = 11
What score was earned by more students than any other score? Why?

Accepted Answer

84;since i

Question 4

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A sample of 26 offshore oil workers took part in a simulated escape exercise,resulting in the accompanying data on time (sec)to complete the escape:
  
-By how much could the largest time,currently 424,be increased without affecting the value of the sample median? By how much could this value be decreased without affecting the value of the sample median?

Accepted Answer

The largest value (currently 424)could b

Question 5

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A small accounting office is trying to determine its staffing needs for the coming tax season.The manager has collected the following data: 46,27,79,57,99,75,48,89,and 85.These values represent the number of returns the office completed each year over the entire nine years it has been doing tax returns.
-For this data,what is the median number of tax returns completed each year?

Accepted Answer

Ranked data: 27,46,48,57,75,79

Question 6

For a particular aptitude test,the mean score was 83.2.Suppose you were told that your score of 87 placed you in the 85th percentile.Assuming the data is bell-shaped,provide an estimate of the standard deviation of the test.

Accepted Answer

At the 85^th percentile,you outperformed mo

Question 7

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

Accepted Answer

A) arithmetic mean 
B) geometric mean 
C) median 
D) mode 
A) arithmetic mean 
B) geometric mean 
C) median 
D) mode

Question 8

Determine if there exists a relationship between vehicle weight and fuel efficiency.

Accepted Answer

A useful rule of thumb is that a relatio

Question 9

In an accounting exam,the standard deviation of the scores of female students is six and the standard deviation of the scores of male students is ten with means for each scores being 80.These statistics indicate that there is less spread in the scores of the female students.

Accepted Answer

A) True 
 B)False

Question 10

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The following data represent a sample of 10 scores on a statistics quiz: 16,16,16,16,16,18,18,20,20,and 20.
-The mean score is:

Accepted Answer

A) 17.0 
B) 17.6 
C) 18.0 
D) 10.0 
A) 17.0 
B) 17.6 
C) 18.0 
D) 10.0

Question 11

For a set of numerical data,the geometric mean is the nth root of the sum of the n observations.

Accepted Answer

A) True 
 B)False

Question 12

What does the relation between the mean and median indicate about the shape of the data?

Accepted Answer

Since the mean is less than th

Question 13

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Starting with a sample of two values 70 and 100,add three data values to your sample to obtain a new sample with certain statistics.
-What are the three data values such that the new sample has a mean of 100 and a mode of 87? Justify your answer.

Accepted Answer

Need two numbers of 87 and one

Question 14

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Starting with a sample of two values 70 and 100,add three data values to your sample to obtain a new sample with certain statistics.
-What are the three data values such that the new sample has a mean of 100 and a median of 70? Justify your answer.

Accepted Answer

Many different answers are possible.Need

Question 15

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A sample of eight doctors was asked how many flu shots they had given to patients this fall.The numbers of flu shots were 6,3,5,24,2,6,0,and 8.
-Find the median time to learn this task.

Accepted Answer

Median = 5

Question 16

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
In a time study,conducted at a manufacturing plant,the length of time to complete a specified operation is measured for each on n = 40 workers.The mean and standard deviation are found to be 15.2 and 1.40,respectively.
-Describe the sample data using the Empirical Rule.

Accepted Answer

To describe the data,calculate these int

Question 17

A valuable use of median and mode would be in a business where inventory contains items of different sizes.

Accepted Answer

A) True 
 B)False

Question 18

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
In a recent survey,200 top executives were asked how many hours they spend each year in community service.The data are presented below.
  
-What is the estimated standard deviation for this data?

Accepted Answer

s² = @#IMG-DLM& Then

Question 19

The type of graph which describes the shape of a distribution in terms of the five-number summary is called a:

Accepted Answer

A) scatter plot. 
B) box-and-whisker plot. 
C) histogram. 
D) bar-plot. 
A) scatter plot. 
B) box-and-whisker plot. 
C) histogram. 
D) bar-plot.

Question 20

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Starting with a sample of two values 70 and 100,add three data values to your sample to obtain a new sample with certain statistics.
-What are the three data values such that the new sample has a mean of 100,a median of 70,and a mode of 87? Justify your answer.

Accepted Answer

Not possible.There must be two 87s in or

Percentiles are values of the variable that divide a set of ranked data into 100 equal subsets.

The mean,median,the second quartile,and the 50th percentile are all the same.

For a particular sample of 50 scores on a statistics exam,the following results were obtained: Mean = 78 Median = 80 Mode = 84 Range = 52 First quartile = 68 Third quartile = 94 Standard deviation = 11 What score was earned by more students than any other score? Why?

For a particular aptitude test,the mean score was 83.2.Suppose you were told that your score of 87 placed you in the 85^th percentile.Assuming the data is bell-shaped,provide an estimate of the standard deviation of the test.

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

Determine if there exists a relationship between vehicle weight and fuel efficiency.

In an accounting exam,the standard deviation of the scores of female students is six and the standard deviation of the scores of male students is ten with means for each scores being 80.These statistics indicate that there is less spread in the scores of the female students.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The following data represent a sample of 10 scores on a statistics quiz: 16,16,16,16,16,18,18,20,20,and 20. -The mean score is:

For a set of numerical data,the geometric mean is the nth root of the sum of the n observations.

What does the relation between the mean and median indicate about the shape of the data?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A sample of eight doctors was asked how many flu shots they had given to patients this fall.The numbers of flu shots were 6,3,5,24,2,6,0,and 8. -Find the median time to learn this task.

A valuable use of median and mode would be in a business where inventory contains items of different sizes.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey,200 top executives were asked how many hours they spend each year in community service.The data are presented below. -What is the estimated standard deviation for this data?

The type of graph which describes the shape of a distribution in terms of the five-number summary is called a:

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters

Exam 2: Describing Data: Numerical

Percentiles are values of the variable that divide a set of ranked data into 100 equal subsets.

The mean,median,the second quartile,and the 50th percentile are all the same.

For a particular sample of 50 scores on a statistics exam,the following results were obtained: Mean = 78 Median = 80 Mode = 84 Range = 52 First quartile = 68 Third quartile = 94 Standard deviation = 11 What score was earned by more students than any other score? Why?

For a particular aptitude test,the mean score was 83.2.Suppose you were told that your score of 87 placed you in the 85th percentile.Assuming the data is bell-shaped,provide an estimate of the standard deviation of the test.

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

Determine if there exists a relationship between vehicle weight and fuel efficiency.

In an accounting exam,the standard deviation of the scores of female students is six and the standard deviation of the scores of male students is ten with means for each scores being 80.These statistics indicate that there is less spread in the scores of the female students.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The following data represent a sample of 10 scores on a statistics quiz: 16,16,16,16,16,18,18,20,20,and 20. -The mean score is:

For a set of numerical data,the geometric mean is the nth root of the sum of the n observations.

What does the relation between the mean and median indicate about the shape of the data?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A sample of eight doctors was asked how many flu shots they had given to patients this fall.The numbers of flu shots were 6,3,5,24,2,6,0,and 8. -Find the median time to learn this task.

A valuable use of median and mode would be in a business where inventory contains items of different sizes.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey,200 top executives were asked how many hours they spend each year in community service.The data are presented below. -What is the estimated standard deviation for this data?

The type of graph which describes the shape of a distribution in terms of the five-number summary is called a:

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters

For a particular aptitude test,the mean score was 83.2.Suppose you were told that your score of 87 placed you in the 85^th percentile.Assuming the data is bell-shaped,provide an estimate of the standard deviation of the test.