Answer the following questions:
a. Construct a 95% confidence interval estimate for the population mean amount spent in the bookstore.
b. Construct a 90% confidence interval estimate for the population proportion of customers who would consider purchasing educational DVDs. Assume that the branch manager of another store in the chain (also located close to a college campus) wants to conduct a similar survey in his store.
c. What sample size is needed to have 95% confidence of estimating the population mean amount spent in this store to within if the standard deviation is assumed to be $10?
d. How many customers need to be selected to have 90% confidence of estimating the population proportion who would consider purchasing the educational DVDs to within ;0.04?e. Based on your answers to (c) and (d), how large a sample should the manager take?