Question: For each of the following statements indicate whether it is

For each of the following statements, indicate whether it is true or false. If false, explain why it is false. In regression analysis:
a. The estimated coefficient of x1 can be positive in the bivariate model but negative in a multiple regression model.
b. When a model is refitted after y = income is changed from dollars to euros, R2, the correlation between y and x1, the F statistics and t statistics will not change.
c. If r2 = 0.6 between y and x1 and if r2 = 0.6 between y and x2, then for the multiple regression model with both predictors R2 = 1.2.
d. The multiple correlation between y and can equal -0.40.

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