Conclusions 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 9090% confidence interval for the proportion of all orders that arrive on time is 8888%plus or minus±77%. What does this mean? Are the conclusions below correct? Explain.
a) Between 8181% and 9595% of all orders arrive on time.
b) 9090% of all random samples of customers will show that 8888% of orders arrive on time.
c) 9090% of all random samples of customers will show that 8181% to 9595% of orders arrive on time.
d) The company is 9090% sure that between 8181% and 9595% of the orders placed by the customers in this sample arrived on time.
e) On 9090% of the days, between 8181% and 9595% of the orders will arrive on time.