Question: Refer to Brand preference Problem 6.5.

1. Fit first-order simple linear regression model (2.1) for relating brand liking (Y) to moisture content (X1). State the fitted regression function.
2. Compare the estimated regression coefficient for moisture content obtained in part (a) with the corresponding coefficient obtained in Problem 6.5b. What do you find?
3. Does SSR(X1) equal SSR(X1|X2) here? If not, is the difference substantial?
4. Refer to the correlation matrix obtained in Problem 6.5a, What bearing does this have on your findings in parts (b) and (c)?

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