Observations (Xi, Yi), i = 1,...,n, are made from a bivariate normal population with parameters (μX, μY,
Question:
(a) Argue that the hypothesis H0: β = 0 is true if and only if the hypothesis Ho: p = 0 is true.
(b) Show algebraically that
where r is the sample correlation coefficient, the MLE of p.
(c) Show how to test H0: p = 0, given only r2 and n, using Student's t with n - 2 degrees of freedom. (Fisher derived an approximate confidence interval for p, using a variance stabilizing transformation. See Exercise 11.4.)
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