Answer Happy

A catalog sales company promises to deliver orders placed on the Internet within 3 days. Follow-up calls to a few randomly selected customers show that a 95% confidence interval for the proportion of all orders that arrive on time is 86% 6%. What does this mean? Are these conclusions correct? Explain. (a) Between 80% and 92% of all orders arrive on time. (b) Ninety-five percent of all random samples of customers will show that 86% of orders arrive on time. (c) Ninety-five percent of all random samples of customers will show that 80% to 92% of orders arrive on time. (d) We are 95% sure that between 80% and 92% of the orders placed by the sampled customers arrived on time. (e) On 95% of the days, between 80% and 92% of the orders will arrive on time.