An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television daily. Based on previousstudies, the standard deviation is assumed to be 17 minutes. The executive wants toestimate, with99% confidence, the mean weekly amount of time to within 4 minutes.

a. What sample size isneeded?

b. If95% confidence isdesired, how many consumers need to beselected?

a. The sample size required for99% confidence is

(Round up to the nearestinteger.)

b. The sample size required for95% confidence is

(Round up to the nearestinteger.)