1 . Use the data " WAGEI. DIA" in the " Textbook_Data" folder on Canvas . Consider the regression model wage = Bo + Breduc + Byexper + BReduc ? + Breduc . exper + Breaper _ + 1. ( a) Using the dataset , regress wage on educ , exper , educ , educ . exper and exper ?` ( b) Under the zero conditional mean assumption , what is the conditional mean of wage given educ and exper ?" ( C ) Holding exper fixed , what is the change in E wage | educ , exper if educ increases from + to + + 1 ?' ( You can take a difference or lise an approximation by the derivative . ) ( d ) Suppose we are interested in whether or not educ affects {\\ wage | educ , exper holding exper fixed . What is the null hypothesis you want to test ?" What is the alternative hypothesis ? What is the restricted model ? Estimate the parameters in the restricted model . Conduct the I test with significance level a = 5% . ( e ) Suppose we are interested in whether or not the effect of educ on E wage / educ , exper ] ( holding* exper fixed ) does not depend on exper . What is the null hypothesis you want to test ? What is the alternative hypothesis ? What is the restricted model ?" Estimate the parameters in the restricted model . Conduct the I' test with significance level " = 5 /0