PSY32 - Lecture 13

PSY32 - Lecture 13 - Today *Admin *Spring Break next week!...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Today *Admin *Spring Break next week! *Paper 2 to be handed back in lecture on Mon, Mar 24 *Reliability and Validity Last Time *Hypothesis Testing Review Reliability and Validity *Validity = accuracy *actually studying the variables intended to be manipulated or measured *Reliability = consistency and dependability *the consistency, stability, or repeatability of a behavior Reliability *Is there consistency and consensus in what variable measures? *A watch that runs correctly but is set 94 minutes fast is low in validity, but high in reliability Perfect Reliability *Perfect reliability means that the scores are perfectly consistent. Good Reliability *Reliability deteriorates when the consistency is lost. *Here the rank orderings are still reasonably consistent. Fair Reliability *As reliability deteriorates further, the rank orderings from the two testings are less similar. Methods of Assessing Reliability *Test-retest *Interrater reliability *Interitem reliability *Internal consistency *Split-half *Cronbachs alpha Measurement Error *measurement error *inaccuracy that exists when measuring a characteristic or behavior Effect of Measurement Error *X = T + e *Note that the average isnt affected by random erroronly the variability Validity *Does variable measure what its supposed to? *A watch that tells good time has high validity *A watch that runs correctly but is set 94 minutes fast has low validity *A broken watch will be valid twice a day Validity *Does variable measure what its supposed to?*Does variable measure what its supposed to?...
View Full Document

Page1 / 5

PSY32 - Lecture 13 - Today *Admin *Spring Break next week!...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online