Question

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 90​% confidence interval for the proportion of all orders that arrive on time is 88​%plus or minus5​%. what does this​ mean? are the conclusions below​ correct? explain. a right parenthesis between 83​% and 93​% of all orders arrive on time. b right parenthesis 90​% of all random samples of customers will show that 88​% of orders arrive on time. c right parenthesis 90​% of all random samples of customers will show that 83​% to 93​% of orders arrive on time. d right parenthesis the company is 90​% sure that between 83​% and 93​% of the orders placed by the customers in this sample arrived on time. e right parenthesis on 90​% of the​ days, between 83​% and 93​% of the orders will arrive on time.

Answer 1

The correct option is;

d. The company is 90% sure that between 83% and 93% of the orders placed by the customers in this sample arrived on time

Step-by-step explanation:

The result of the follow up show that at a 90% confidence level, the proportion of the deliveries that arrived on time is between 93% and 83%.That is the highest proportion the company is confident arrived on time is 93% while the lowest proportion the company is 90% confident arrived on time is 83%.

Therefore, option d. (the company is 90% sure that between 83% and 93% of the orders placed by the customers in this sample arrived on time.