試題詳解

複選題
17. According to a model regressing a firm's monthly sales (in thousands) of a product on the price of that product, the 90% confidence interval on the average monthly sales is [5.3, 7.7] if the price is $6. Which of the following could be the 90% prediction interval for a single month sales if the price is $6?
(A)[4.4,8.2];
(B)[4.4,8.6];
(C) [5.9,7.1];
(D)[5.4,8.4].