Questions A and B

An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television daily. Based on previous studies, the standard deviation is assumed to be 25 minutes. The executive wants to estimate, with 09% confidence, the mean weekly amount of time to within 1 5 minutes. a. What sample size is needed? b. If 85% confidence is desired, how many consumers need to be selected? a. The sample size required for 90%% confidence is- (Round up to the nearest integer.)