PSYB01H3 Chapter Notes - Chapter 5: Construct Validity, Face Validity, Intelligence Quotient
Document Summary
Pearson product-moment correlation coefficient: r, -1. 00 to +1. 00: reliability correlation. To assess reliability we need at least 2 scores from many individuals. Test-retest reliability: assessed by measuring the same individuals at two points in time reliability coefficient should be at least . 80 ie. measure group one day and another day of the week. May be high because ppl rem how they answered before can use alternative forms some very reliable iq, some not mood. Cronbach"s alpha: based on the individual items: the correlation of each item with every other item. Item-total correlation: examine the correlation of each item score with the total score based on all items. Items that do not correlate with others can be eliminated > increasing reliabi. Interrater reliability: the extent to which raters agree in their observations [cohen"s kappa], high number of observations that result in similar judgment. Reliability and accuracy of measures example: shoe size measurement device as intelligence measure.
