n her book Red Ink Behaviors, Jean Hollands reports on the assessment of leading Silicon Valley companies regarding a manager's lost time due to inappropriate behavior of employees. Consider the following independent random variables. The first variable x1 measures manager's hours per week lost due to hot tempers, flaming e-mails, and general unprodu

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In her book Red Ink Behaviors, Jean Hollands reports on the assessment of leading Silicon Valley companies regarding a manager's lost time due to inappropriate behavior of employees. Consider the following independent random variables. The first variable x1 measures manager's hours per week lost due to hot tempers, flaming e-mails, and general unproductive tensions.

x1: 1 5 8 4 2 4 10

The variable x2 measures manager's hours per week lost due to disputes regarding technical workers' superior attitudes that their colleagues are "dumb and dispensable".

x2: 8 5 6 7 9 4 10 3

 

Use a calculator with sample mean and sample standard deviation keys to calculate x1s1, x2, and s2. (Round your answers to four decimal places.)

What is the value of the sample test statistic? Compute the corresponding z or t value as appropriate. (Test the difference ?1 − ?2. Do not use rounded values. Round your final answer to three decimal places.)

 

(b) Find a 95% confidence interval for ?1 − ?2. (Round your answers to two decimal places.)

 

 

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