Question: 2. Consider the information given in Exercise 2 in Section 4.2 regarding the amount, X, of drug administered to a randomly selected laboratory rat, and

2. Consider the information given in Exercise 2 in Section 4.2 regarding the amount, X, of drug administered to a randomly selected laboratory rat, and number, Y, of tumors the rat develops.

(a) Would you expect X and Y to be positively or negatively correlated? Explain your answer, and confirm it by computing the covariance.

(b) Compute the linear correlation coefficient of X and Y.

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