Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_uu-Effect-size-812-en_uu-Effect-size-812-en
   name	uu-Effect-size-812-en
   section	Inferential Statistics/Effect size
   type	schoice
   solution	FALSE, FALSE, FALSE, TRUE
   Type	Case
   Language	English
   Level	Statistical Literacy

   Question

   Ordinary light bulbs have an average life of 1600 hours with a standard deviation of 100 hours. The average lifetime of 100 randomly selected incandescent bulbs of brand X is 1800 hours. For the light bulbs of brand X, what is the effect size expressed in Cohen’s d?

   
   
   1. FALSE: $d = 0.1$.
   2. FALSE: $d = 0.2$.
   3. FALSE: $d = 1$.
   4. TRUE: $d = 2$.