Suppose that (Yi , Xi ) satisfy the least squares assumption
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Suppose that (Yi , Xi ) satisfy the least squares assumptions in Key Concept 4.3 and, in addition, ui is N(0, s2 u) and
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Suppose that (Yi , Xi ) satisfy the least squares assumptions in Key Concept 4.3 and, in addition, ui is N(0, s2 u) and is independent of Xi. A sample of size n = 30 yields Yn = 43.2 + 61.5X, R2 = 0.54, SER = 1.52, (10.2) (7.4) where the numbers in parentheses are the homoskedastic-only standard errors for the regression coefficients. a. Construct a 95% confidence interval for b0. b. Test H0 : b1 = 55 vs. H1 : b1 ? 55 at the 5% level. c. Test H0 : b1 = 55 vs. H1 : b1 7 55 at the 5% level.
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