Suppose the mean per-person check for brunch at a restaurant chain is approximately $11.75.

a. Assuming a standard deviation of $3.00, what sample size is needed to estimate, with 99% confidence, the mean per-person check for brunch to within $0.25?

The sample size needed is

959- correct answer

(Round up to the nearest integer.)

b. Assuming a standard deviation of $4.50, what sample size is needed to estimate, with 99% confidence, the mean per-person check for brunch to within $0.25?

The sample size needed is

enter your response here.

(Round up to the nearest integer.)