Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_eur-inferential_statistics-209-en_eur-inferential_statistics-209-en
   name	eur-inferential_statistics-209-en
   section	Inferential Statistics/Effect size/Cohen's d, Reliability/Analysis/Cronbach's alpha
   type	num
   solution	0.64
   tolerance	0
   Type	Calculate
   Program	SPSS
   Language	English
   Level	Statistical Literacy

   Question

   An experiment of a PhD student has a reliability of .64 and true score effect size of .8. Calculate the expected effect size using the formula: $d_{Xo} = d_{Xt} \times \sqrt{r_{xx}}$. Round to 2 decimals.

   
   

   Solution

   Given the above formula, the true score effect size (.8) and the reliability (.64), the expected effect size is $d_{Xo} = .8 \sqrt{.64} = .64$