Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_vufsw-intercept-1355-en_vufsw-intercept-1355-en
   name	vufsw-intercept-1355-en
   section	inferential statistics/regression/intercept
   type	schoice
   solution	FALSE, TRUE, FALSE, FALSE
   Type	interpreting output
   Program	NA
   Language	English
   Level	statistical reasoning

   Question

   Field describes a study on the growing interest in cosmetic surgical treatments. He collected data on the quality of life among a sample of respondents some of whom some had undergone cosmetic surgery and some were still on the waiting list for it. waiting list for it (variable: surgery: 0 = waiting list, 1 = cosmetic surgery). It measured the quality of life at registration for the cosmetic surgery, the “baseline” quality of life (variable: Base_Qol, scale 0-1, a higher score means higher quality of quality of life) and after a while, after the surgery had taken place for those who underwent the surgery immediately, but also at the same time for the group who were still on the waiting list (variable: Post_Qol, scale 0-100, a higher score means a higher quality of life).

   Below are the results of a regression analysis with the post-measurement of quality of life as the dependent variable (Post-QOL), and in which having or not having undergone the cosmetic surgery (Surgery) and the “baseline” quality of life (Base_Qol) in the model are included. Moreover, in model 2, the interaction between ‘surgery’ and ‘baseline’ quality of life were added to the model (Base_Qol_surgery).

   

   How should the constant of model 1 be interpreted?

   
   
   1. FALSE: As the lowest score on Postthat appears in the data
   2. TRUE: If the predicted score on Post_Qol of a person still on the waiting list and who scores 0 on the “baseline” quality of life
   3. FALSE: If the predicted score on the ‘baseline’ quality of life, Base|Qol, of someone still on the waiting list who scores 0 on the ‘Post’ quality of life.
   4. FALSE: If the lowest score on Post_Qol appearing in the data where held constant on the ‘baseline’ quality of life and on ‘surgery’
   
   
   1. False
   2. True
   3. False
   4. False