Scarlett and Heather, the owners of an upscale restaurant in Dayton, Ohio, want to study the dining characteristics of their customers. They decide to focus on two variables; the amount of money spend by customers and whether customers order dessert. The results from a sample of 60 custoemrs are as follows:
Amount spend: X-bar = $38.54, S = $7.26.
18 customers purchased dessert.
a. Construct a 95% confidence interval estimate for the population mean amount spend per customer in the restaurant.
b. Construct a 90% confidence interval estimate for the population proportion of customers who purchase dessert.