A company that sells its products through mail-order catalogs wants information about the success of its most

Question:

A company that sells its products through mail-order catalogs wants information about the success of its most recent catalog. The company decides to estimate the mean dollar amount of items ordered from those who received the catalog. For a random sample of 100 customers from their files, only 5 made an order, so 95 of the response values were $0. The overall mean of all 100 orders was $10, with a standard deviation of $10.
a. Is it plausible that the population is normal? Explain, and discuss how much this affects the validity of a confidence interval for the mean.
b. Find a 95% confidence interval for the mean dollar order for the population of all customers who received this catalog. Normally, the mean of their sales per catalog is about $15. Can we conclude that it declined with this catalog? Explain.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...