Hw 5 Concepts

In a multiple regression model, which of the following is correct regarding the value of the adjusted r^2

It can be negative.

In a multiple regression problem involving two independent variables, if b1 is computed to be +2.0, it means that

the estimated mean of Y increases by 2 units for each increase of 1 unit of X1, holding X2 constant.

An interaction term in a multiple regression model may be used when

the relationship between X1 and Y changes for differing values of X2.

dummy variable

1-variable categories

A dummy variable is used as an independent variable in a regression model when

the variable involved is categorical.

To properly examine the effect of a categorical independent variable in a multiple linear regression model we use an interaction term.

False