Question

According to the National Restaurant Association, 23% of fine-dining restaurants have instituted policies restricting the use of cell phones. Cannot use PHstat or Excel for this problem. Compute the values manually.

1. If you select a sample of 125 fine-dining restaurants, what is the probability that the sample has between 18% to 28% restaurants that have established policies restricting the use of cell phones?

2. If you select a sample of 125 fine-dining restaurants, compute the symmetrical limits within which the sample percentage will be contained 95% of the time.

Answer 1