Psychology 2800E Lecture Notes - Lecture 19: Random Assignment

• School: Western University
• Department: Psychology
• Course: Psychology 2800E
• Professor: Doug Hazlewood

Document Summary

Prologue: age as an iv: age is a quasi independent variable: A participant variable that can"t be manipulated with random assignment: unlike gender, age changes over time: Age can be a between-group factor (compare different age groups at same point in time) Age can be a within-group factor (compare same group as they get older over time: age introduces a unique set of confounds. Is the effect due to: age? (number of years person has lived, year of birth? (if different age groups are studied at the same time, time of testing? (if same group is studied at different times) Study different age groups at the same time: a between-group design. Differences between groups could be due to different ages (an age effect); or. Solution to problem of cohort confounds: eliminate cohorts. Study a single cohort over time: a within-group design.