Psychology 2800E Lecture Notes - Observational Error, Tape Measure, Discriminant

• School: Western University
• Department: Psychology
• Course: Psychology 2800E
• Professor: Prof

Document Summary

; metal expands in a hot room, so if measured in a hot room you will appear to be shorter) By maximizing the reliability and validity of measures. Part 1: reliability (minimizing random error: the more is better rule: random error will cancel out over repeated measurements. His true ability at basketball is better than yours. One grandfather says i have one grandchild and it"s a boy, can"t believe it . Second grandfather says i just can"t believe it i have 20 grandchildren and they"re all boys . ^ number of observations, so random error will cancel out: we can decrease random error by ^ the reliability of our measures. A measure is reliable if it measures things consistently: types of reliability, internal reliability: or internal consistency relevant when measure consists of multiple items (exam) Inconsistency can be a sign of random error.