Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_eur-inferential_statistics-220-en_eur-inferential_statistics-220-en
   name	eur-inferential_statistics-220-en
   section	Inferential Statistics/NHST/p-value
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Conceptual
   Program
   Language	English
   Level	Statistical Literacy

   Question

   In a repeated measures design with anxiety as the outcome variable and the variable stimulus (neutral, picture of spider, real spider) as ws-factor, Post-hoc tests are conducted for the significant main effect of stimulus.

   The mean difference between neutral and real spiders is 3.5. The Post-hoc test for this difference in SPSS results in t(7) = -4.78, p = .002 (two-tailed). What does this p-value represent?

   The above p-value indicates that the probability of finding:

   
   
   1. FALSE: A mean population difference between neutral and real spiders of 0 is .002 or more extreme.
   2. FALSE: A mean sample difference between neutral and real spiders of plus or minus 3.5 is .002.
   3. TRUE: A mean sample difference between neutral and real spiders of plus or minus 3.5 or more extreme when the population difference equals 0 is .002.
   4. FALSE: A mean sample difference between neutral and real spider that is significant in the population when the population difference equals 0 is .002 or more extreme.
   
   

   Solution

   The p-value represents the probability of the sample result found (in this case a difference between the groups of 3.5 points) or more extreme if the null hypothesis were true.

   
   
   1. False
   2. False
   3. True
   4. False