Variables
Is explored to see whether any change has occurred as a function of the treatment
dependent variable
means that the measure is consistent in measuring what it was designed to measure
Reliability
What two types of reliability use the correlation coefficient
Test-Retest and Parallel Forms
is the treatment
independent variable
When you want to know whether a test is reliable over time
Test–retest reliability
What type of reliability is measured by dividing # of measurements that are same by total number of measurements
Inter-rater
When you want to know if several different forms of a test are reliable or equivalent
Parallel-forms reliability
What is the acceptable reliability for Test-Retest and Parallel Forms
𝒓>.𝟕
When you want to know if the items on a test assess one—and only one—dimension
Internal-consistency reliability
What is the acceptable reliability for Inter-rater
𝒓>.𝟖
When you want to know whether there is consistency in the rating of some outcome
Interrater reliability
How do you measure Internal-consistency reliability
Solving for cronbach's alpha