Exam 1

1. Metainformation

   Tag	Value
   file	Reliability_uu-Cronbachs-alpha-003-en_uu-Cronbachs-alpha-003-en
   name	uu-Cronbachs-alpha-003-en
   section	Reliability/Analysis/Cronbach's alpha
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Interpreting output
   Program	SPSS
   Language	English
   Level	Statistical Literacy

   Question

   A group of researchers want to develop an instrument that measures how traumatized children are after experiencing a car accident. Based on existing trauma literature, they created items belonging to one of the following scales: re-experiencing, avoidance, arousal, and sleep problems. Because the children themselves are too traumatized, they are taking their 36 items from 314 parents. Because the researchers expect four subscales, they conduct a factor analysis with 4 factors. Part of the SPSS output is below.

   

   One of the researchers, Rolf, is specifically interested in the sleep problems parents observe in these children. For this reason, he creates a scale for sleep problems consisting of 6 items. When Rolf performs a reliability analysis, he finds a Cronbach’s alpha of 0.725. Below is part of the SPSS output.

   

   Based on this data, Rolf decides not to remove items from this scale. He gives two arguments for this:

   I. Removing items creates the danger of affecting content validity. II. Because the scale consists of only 6 items, the scale with all 6 items will be more reliable than a scale with only 5 or even only 4 items.

   
   
   1. FALSE: Only statement I is correct
   2. FALSE: Only statement II is correct
   3. TRUE: Both statements are correct
   4. FALSE: Neither statement is correct
   
   

   Solution

   Both statements are correct.

   
   
   1. Statement I is indeed correct. But so is statement II.
   2. Utterance II is indeed correct. But so is statement I.
   3. Both statements are indeed correct.
   4. Both statements are correct.