suppose you as the manager of Austin bbq ribs, would like to develop a 95% CI for the number of customers who will enter your store on any given day. your sample mean was 507 xbar =507 with a known population standard deviation of 70 customers yo plan to use a sample size of 50 random days to count customers. Assume a normal distribution
What is the margin of error
What is the ci interval based on your margin of error
If you wanted to ensure a margin of error of no more than 15 customers what sample size do you need?