Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_uu-Statistical-errors-601-en_uu-Statistical-errors-601-en
   name	uu-Statistical-errors-601-en
   section	Inferential Statistics/NHST/Statistical errors
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Conceptual
   Program
   Language	English
   Level	Statistical Literacy

   Question

   If a key is executed with $\alpha = 5$ and has a power of $80$, then what is the probability that the $H_0$ rightly rejected?

   
   
   1. FALSE: 5%
   2. FALSE: 20%
   3. TRUE: 80%
   4. FALSE: 95%
   
   
   1. 5% is the probability that $H_0$ is rejected while correct (probability of a Type I error).
   2. 20% is the probability that $H_0$ is not rejected when it should have been rejected (probability of a Type II error).
   3. 80% is the probability of finding an effect in the sample when it is actually present in the population. Thus, this is the probability $H_0$ is rejected while it is also incorrect (and thus rightly rejected).
   4. 95% is the probability that $H_0$ is not rejected when it is actually true.