PS295 Lecture Notes - Lecture 10: Uncorrelated Random Variables, Random Assignment, Repeated Measures Design
Document Summary
Types of experimental designs - assignment to conditions. Types of experimental designs: summary: randomized groups design, between-subjects design, uncorrelated groups design, matched-subject design, between-subjects design, correlated groups design, repeated measures design, within-subject design, correlated groups design. Extraneous variables such as: **individual differences: pre-existing traits, abilities, etc*, transient states in participants, environmental factors: time of day, rooms, level of noise, etc, differential treatment: slight differences in experimenter"s behavior, unreliable measures. Example experiment: hypothesis: people rate job candidates more positively when they act assertive rather than submissive, participants watch video tapes of interviews, iv: whether a candidate acts assertive or submissive, dv: liking of the candidate. Between subjects: researcher creates two conditions, uses random assignment (or blocked random assignment) to assign participants to the two conditions. Uncorrelated groups: researcher can not assess the influence that subject variables are having within each condition. Between subjects: researcher creates two conditions, uses random assignment (or blocked random assignment) to assign participants to.
