Calculate the margin of error and construct the confidence interval for the population mean using the Student's t-distribution (you may assume the population data is normally distributed).

T-Distribution Table

a. x=89.6,n=66,s=19.9,x=89.6,=66,=19.9, 98% confidence

E==

Round to two decimal places if necessary

<<<<

Round to two decimal places if necessary

b. x=30.9,n=45,s=18.7,x=30.9,=45,=18.7, 98% confidence

E==

Round to two decimal places if necessary

<<<<

Round to two decimal places if necessary