A variable that takes on the values of 0 or 1 and is used to incorporate the effect of categorical variables in a regression model is called

A.	an interaction
B.	a constant variable
C.	a dummy variable
D.	none of these alternatives is correct

In a regression model, which of the following tests is used in order to determine whether an individual independent variable is significant?

A.	t test
B.	z test
C.	F test
D.	chi-sqauretest

Very Basic Questions. I just cannot remember the answer and need to know for my exam this week. No math needed.