Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_uu-Dummies-802-en_uu-Dummies-802-en
   name	uu-Dummies-802-en
   section	Inferential Statistics/Regression/Dummies
   type	schoice
   solution	FALSE, TRUE, FALSE, FALSE
   Type	Case
   Language	English
   Level	Statistical Literacy

   Question

   In subjects, decreases in depression are measured on a continuous scale (Y). One is interested in the effects of three types of therapies: A, B or C, but one also measures background variables $X_{1}$ and $X_{2}$. To predict the decrease in depression, two dummy variables are created for therapy:

   

   The regression equation for Y is: $$hat{Y}$ = 6.0 - 1.2$D_{1}$ + 1.4$D_{2}$ + 2$X_{1}$ +3$X_{2}$

   When choosing the two dummy variables, one of the therapies became reference category. If dummy variables other than the two chosen in Question 6 are chosen, then…

   
   
   1. FALSE: Changes a person’s estimated decline.
   2. TRUE: Changes the constant (the intercept).
   3. FALSE: Changes the B values of the X variables.
   4. FALSE: More than 1 of the three alternatives (a), (b) and (c) is TRUE.