A catalog sales company promises to deliver orders placed on the Internet within

Question

A catalog sales company promises to deliver orders placed on the Internet within four days. Follow-up calls to randomly selected customers show that a 95% confidence interval for the proportion of all orders that arrive on time is 83% ± 6%. What does this mean? Are the following conclusions correct? (a) Between 77% and 89% of all orders arrive on time. (b) 95% of all random samples of customers show that 83% of orders arrived on time. (c) 95% of all random samples of customers will show that 77% to 89% of orders arrived on time (d) We are 95% sure that between 77% and 89% of the orders placed by the customers in this sample arrived on time. (e) On a randomly chosen day, we can be 95% confident that between 77% and 89% of the large volume of orders will arrive on time What does this mean? A. This means the procedure that produced this interval generates ranges that hold the population mean for 95% of samples. B. This means that there is a 95% chance that the standard deviation is 6%. ° C. This means that there is a 95% chance that the mean proportion is 83%. 0 D. This means that we are 95% sure that all orders arrive on time. Are the conclusions given in the problem statement correct? Select all that apply. (a) (b) (c) (d) (e) None of the above

Explanation / Answer

1) option A is correct: this means the procedure...........

2) conclusion : option E; on a radomely chosen day..............

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