The Human Resources department of a consulting firm gives a standard creativity test to random selected group of new hires every year. This year 75 new hires took the test and scored a mean of 113.5 points with a standard deviation of 14.9. Last year 80 new hires took the test and scored a mean of 116.5 points with a standard deviation of 15. Assume that the population standard deviation 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 deviation as samples used were quite large. Construct a 90% confidence interval for u1 -u2, the difference between the mean test scores u1 of new hires from the current year and the mean test score u2 of new hires from last year. Then complete the table and carry your computation at three decimals and round your answer to at at least two decimals.

what is the lower limit of the 90% confidence interval

what is upper limit of the 90% confidence interval