Question 1

Describe the shape of the distribution of the number of trades per month for these 10 clients.Justify your answer.

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Question 2

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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 interquartile for the number of tax returns completed each year?

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Question 3

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (40,13),(15,33),(16,42),(39,9),(20,38),(35,15),(25,21),(34,17),(20,24),and (34,21). -Calculate the variances and ,and the covariance s_xy of the sample data.

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Question 4

The manager of the help-line at a local software manufacturing firm collected data on the number of calls the help desk received per shift for the last 100 days.The data is summarized in the table below.
  
What is the estimated mean number of calls per night? What is the estimated standard deviation?

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Question 5

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An investment councilor recently reviewed the account activity of a sample of 10 of his clients and calculated the average number of stock trades per month over the past year for each client.He obtained the following data values: 10.2,2.5,11.4,3.2,1.1,3.4,8.4,9.7,11.2,and 2.4
-Calculate the median number of trades per month for these 10 clients.

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Question 6

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
An investment councilor recently reviewed the account activity of a sample of 10 of his clients and calculated the average number of stock trades per month over the past year for each client.He obtained the following data values: 10.2,2.5,11.4,3.2,1.1,3.4,8.4,9.7,11.2,and 2.4
-Calculate the standard deviation.

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Question 7

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
An investment councilor recently reviewed the account activity of a sample of 10 of his clients and calculated the average number of stock trades per month over the past year for each client.He obtained the following data values: 10.2,2.5,11.4,3.2,1.1,3.4,8.4,9.7,11.2,and 2.4
-Calculate the average number of trades per month for these 10 clients.

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Question 8

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.

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Question 9

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 coefficient of variation for the number of tax returns completed each year?

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Question 10

The supervisor of a tourist information desk at a local airport is interested in how long it takes an employee to serve a customer.Using a stopwatch,he measures the amount of time it takes for each of 10 customers.These times,measured in minutes,are reported as follows: 2.3,1.5,3.9,0.6,2.7,3.1,2.8,0.9,1.4,and 2.6.Calculate the standard deviation and the interquartile range.

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Question 11

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Consider the following (x,y)sample data: (40,13),(15,33),(16,42),(39,9),(20,38),(35,15),(25,21),(34,17),(20,24),and (34,21). 
-Calculate the correlation coefficient sample data.

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Question 12

Compute the mean,standard deviation and interquartile range for the following sample data: 12.2,15.9,8.1,19.2,13.7,7.2,12.2,10.9,5.4,and 16.8.

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Question 13

The following values represent the annual snowfall,measured in inches,at a local ski resort over the past 10 years: 123,87,143,133,182,176,96,104,201,and 152.What is the mean snowfall over the past 10 years? What is the standard deviation?

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Question 14

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 mean number of tax returns completed each year?

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Question 15

A researcher interested in determining the average monthly expenditures of college students on DVDs finds that for a sample of 25 students,the mean expenditure was $24.40,and the median expenditure was $21.76.Specify the shape of the histogram for this data.Does this shape make sense? Why?

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Question 16

The manager of 45 sales people examined their monthly expenditures on entertaining clients.He found that the mean amount was $237.50 with a standard deviation of $27.40.Assuming the data is bell-shaped,would a claim for the amount of $300 be considered unlikely? Why or why not?

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Question 17

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?

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Question 18

The shift supervisor at a local manufacturing plant collected data on the number of defects coming off an assembly line over the past eight weeks (40 work days).She summarized the data in the following frequency table.
  
What is the weighted average number of errors per night?

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The answer of The shift supervisor at a local manufacturing...

Question 19

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 variance of the number of tax returns completed each year?

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Question 20

For the sample data shown below,compute the five-number summary,and sketch out the Box-and-Whisker plot.

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Quiz 2: Describing Data: Numerical

Describe the shape of the distribution of the number of trades per month for these 10 clients.Justify your answer.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (40,13),(15,33),(16,42),(39,9),(20,38),(35,15),(25,21),(34,17),(20,24),and (34,21). -Calculate the variances and ,and the covariance sxy of the sample data.

The manager of the help-line at a local software manufacturing firm collected data on the number of calls the help desk received per shift for the last 100 days.The data is summarized in the table below. What is the estimated mean number of calls per night? What is the estimated standard deviation?

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.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (40,13),(15,33),(16,42),(39,9),(20,38),(35,15),(25,21),(34,17),(20,24),and (34,21). -Calculate the correlation coefficient sample data.

Compute the mean,standard deviation and interquartile range for the following sample data: 12.2,15.9,8.1,19.2,13.7,7.2,12.2,10.9,5.4,and 16.8.

The following values represent the annual snowfall,measured in inches,at a local ski resort over the past 10 years: 123,87,143,133,182,176,96,104,201,and 152.What is the mean snowfall over the past 10 years? What is the standard deviation?

A researcher interested in determining the average monthly expenditures of college students on DVDs finds that for a sample of 25 students,the mean expenditure was $24.40,and the median expenditure was $21.76.Specify the shape of the histogram for this data.Does this shape make sense? Why?

The manager of 45 sales people examined their monthly expenditures on entertaining clients.He found that the mean amount was $237.50 with a standard deviation of $27.40.Assuming the data is bell-shaped,would a claim for the amount of $300 be considered unlikely? Why or why not?

The shift supervisor at a local manufacturing plant collected data on the number of defects coming off an assembly line over the past eight weeks (40 work days).She summarized the data in the following frequency table. What is the weighted average number of errors per night?

For the sample data shown below,compute the five-number summary,and sketch out the Box-and-Whisker plot.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following (x,y)sample data: (40,13),(15,33),(16,42),(39,9),(20,38),(35,15),(25,21),(34,17),(20,24),and (34,21). -Calculate the variances and ,and the covariance s_xy of the sample data.

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.