Last year a sample of US adults showed that 16% went shopping on Thanksgiving Day. This year, a group wants to make a 95% confidence interval of all US adults that are going shopping this year. The groups wants the margin of error to be 4.5%. Enter your answers as whole numbers.

(a) What is the minimum sample size required to obtain this type of accuracy? Use the prior year's sample proportion in your calculation.

The minimum sample size is _ U.S. adults.

(b) What is the minimum sample size required to obtain this type of accuracy when you assume no prior knowledge of the sample proportion?

The minimum sample size is _ U.S. adults.