Question

To test the validity of a multiple regression model involving 2 independent variables, the null hypothesis is that: Which of the following is not true when we add an independent variable to a multiple regression model? A. The unadjusted coefficient of determination may increase or decrease OB. The unadjusted coefficient of determination always increases C. The adjusted coefficient of determination may increase A multiple regression model has the form The coefficient bi is interpreted as the: A. change in y per unit change in x1, holding x2 constant B. change in the average value of y per unit change in xi, holding x2 constant C. change in y per unit change in xi, when x and x2 values are correlated D. change in y per unit change in x

I tried every option for the second question but apparently at least one of my answers is still incorrect, i thought the last question was correct as well but im not sure now?

Answer 1

here first two are correct

for last one please try option B : change in the average value of y per unit change in xq , holding x2 constant,