1. What sample size is needed to have 90% confidence of estimating the population mean amount spent in her restaurant to within $2.00, assuming that the standard deviation is estimated to be $8?

d. How many customers need to be selected to have 95% confidence of estimating the population proportion of customer who purchase dessert to within 0.04?

e. Based on your answers to (c) and (d), how large of a sample should Jeanine take?