5.已知自變數Ｘ與依變數Ｙ的相關係數為 0.8，則其迴歸方程式的判定係數為______ ？ (A) 0.5 (B) 0.8 (C) 0.64 (D) 無法確定。

Problem 19. Suppose a simple random sample of n=2 homes is to be selected from this population of five homes. Which of the following statements concerning this sampling procedure is correct?(A) The resulting sample mean will be identical to the population mean.(B) The sampling procedure guarantees that the sample will not be comprised of two houses immediately next to one another on the cul-de-sac.(C) Homes with larger property taxes are relatively more likely to be selected than are homes with smaller property taxes.(D) The sample mean property taxes paid, X, is certain to be no larger than $547.5.(E) None of the above.

5.已知自變數Ｘ與依變數Ｙ的相關係數為 0.8，則其迴歸方程式的判定係數為______ ？
(A) 0.5
(B) 0.8
(C) 0.64
(D) 無法確定。

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