he human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year,  new hires took the test and scored a mean of  points with a standard deviation of . Last year,  new hires took the test and scored a mean of  points with a standard deviation of . Assume that the population standard deviations of the test scores of all new hires in the current year and the test scores of all new hires last year can be estimated by the sample standard deviations, as the samples used were quite large. Construct a  confidence interval for , the difference between the mean test score  of new hires from the current year and the mean test score  of new hires from last year. Then complete the table below.Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult a list of formulas.)

 

What is the lower limit of the 95% confidence interval?

 

What is the upper limit of the 95% confidence interval?

 

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