to estimate the mean distance that your customers travel to get to your store, with 90% confidence that your result is within 0.3 miles. A pilot sample has standard deviation 2.2. Using the equation to find the required sample size, you would put in

a)0.5for , and a) 0.3 for e.

b)0.90b) 0.5

c)0.3c) 2.2

e)2.2e) .90