The employees of a large international company would like to have vision care as part of their benefits package. A researcher needs to estimate the amount of money that employees and their beneficiaries spend on such treatment, on average. A sam a sample of 900 employees reveals the mean amount spent last year was $999.06, with a standard ] deviation of $137.19. We assume that the population standard deviation is close to the last number, Please, use the following table (do not use Excel) to answer the questions about 3= , Do not round the values as and keep the number of decimal places as in the table Table of z,, and za for most common a values 0.005 0.01 0.02 0.03 0.04 0.05 0.06 0.1 2.575 2.33 2.05 1.88 1.75 1.645 1.555 2.81 2.575 2.33 2.17 2.05 1.96 1. (a) Construct a 95% confidence interval for the population mean amount spent on vision care. Find 24 = Round the confidence interval values to 2 decimal places What is the 95% confidence interval? (b) Construct a 90%% confidence interval for the p vision care. Find ze =