Question: Streams again Here is a regression model in which the variable Alkali has been included in the model from Exercise 37: Response variable is: BCI

Streams again Here is a regression model in which the variable Alkali has been included in the model from Exercise 37:

Response variable is: BCI R squared = 37.8%

s = 130.1 with 163 - 3 = 160 degrees of freedom Variable Coefficient SE(Coeff) t-ratio P-value Intercept 1641.48 271.1 6.06 60.0001 pH -28.9009 39.92 -0.724 0.4701 Alkali -1.45740 0.2774 -5.25 60.0001

a) State the null and alternative hypotheses about the coefficient of pH in this regression.

b) Assuming that the assumptions for regression inference are reasonable, test the hypothesis and state your conclusion.

c) Account for any differences with the conclusion you drew in exercise 37

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