Dummy variables are useful because they enable you to use a ...

[dbose]

Dummy variables are useful because they enable you to use a single regression equation to represent multiple _______________.
 
  Fill in the blank(s) with correct word

Question 2

In an experiment, confounding occurs when
 
  a. there is a main effect of the independent variable being manipulated.
  b. a second variable is unintentionally manipulated along with the independent variable so that it is not clear which variable has had an effect.
  c. there is a second dependent variable that changes as a result of the independent variable manipulation.
  d. there is no significant effect of the independent variable manipulation.

[lin77x]

Answer to Question 1

groups

Answer to Question 2

B