Jeanine, the owner of a competing restaurant, wants to conduct a similar survey in her restaurant. Jeanine does not have access to the information that Scarlett and Heather have obtained from the survey they conducted. Answer the following questions:
a. What sample size is needed to have 95% confidence of estimating the population mean amount spend in her restaurant to within +$1.50, assuming that the standard deviation is estimated to be $8?
b. How many customers need to be selected to have 90% confidence of estimating the population proportion of customers who purchase dessert to within =.04?
c. Based on your answers to (c) and (d), how large a sample should Jeanine take?