An advertising executive wants to estimate the mean amount of time that consumers spend with digital media daily. From past studies, the standard deviation is estimated as 50 minutes.

a.	What sample size is needed if the executive wants to be 90% confident of being correct to within 4 minutes?
b.	If 95% confidence is desired, how many consumers need to be selected?

a.

A sample size of enter your response here consumers is needed.(Round up to the nearest integer.)

Part 2

b. If 95% confidence is desired, enter your response here consumers need to be selected.(Round up to the nearest integer.)