A catalog sales company promises to deliver orders placed on theInternet within 3 days.? Follow-up calls to a few randomly selectedcustomers show that a 90?% confidence interval for the proportionof all orders that arrive on time is 88?% ±4?%. What does this?mean? Are the conclusions below? correct? Explain.
a) Between 84?%
and 92?%
of all orders arrive on time. |
b) | 90?% of all random samples of customers will show that 88?% of orders arrive on time. |
c) | 90?% of all random samples of customers will show that 84?% to 92?%
of orders arrive on time. |
d) | The company is 90?%
sure that between 84?%
and 92?%
of the orders placed by the customers in this sample arrived ontime. |
e) | On 90?%
of the? days, between 84?%
and 92?%
of the orders will arrive on time. |
