Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_uu-Power-828-en_uu-Power-828-en
   name	uu-Power-828-en
   section	Inferential Statistics/NHST/Power
   type	schoice
   solution	FALSE, FALSE, FALSE, TRUE
   Type	Conceptual
   Program
   Language	English
   Level	Statistical Literacy

   Question

   A professor of psychology is conducting a study of depressed feelings among students at Utrecht University who are all taking his relaxation therapy. The hypotheses he wants to test are H0: $\mu$ = 3.0 vs. H1: $\mu$ < 3.0. To do this, he plans to use a sample of 25 students who will all complete a questionnaire about depressed feelings (with scores on a 5-point Likert scale). He chooses a significance level of $\alpha$ = 1%. The power is calculated for this test and is found to be only 68%. In which of the following situations will the power not go up?

   
   
   1. FALSE: Using a sample of 50 students.
   2. FALSE: Testing at $\alpha$ = 5%.
   3. FALSE: Calculate the power with a larger expected effect.
   4. TRUE: Two-sided testing.
   
   
   1. This answer is incorrect.
   2. This answer is incorrect.
   3. This answer is incorrect.
   4. This answer is correct.