The U.S. Census Bureau collects data on the ages of married people. Suppose that eight married couples are randomly selected and have the ages given in the following table. Determine the90%confidence interval for the true mean difference between the ages of married males and married females.

Letd=(ageofhusband)(ageofwife). Assume that the ages are normally distributed for the populations of both husbands and wives in the U.S.

Husband6257442849514633

Wife6548413445405237

Find the mean of the paired differences,d. Round your answer to one decimal place.

Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places

Find the standard deviation of the paired differences to be used in constructing the confidence interval. Round your answer to one decimal place.

Construct the90%confidence interval. Round your answers to one decimal place

(PLEASE Highlight or mark each answer)