Psychology 2800E Final: ALL Final Notes -

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

Document Summary

Example 2: evaluating golf balls ( a & b ) Iv = type of ball (each ball is a treatment or condition) In btw-group design 2 groups with random assignment to each group: group 1 hits ball a; group 2 hits ball b, with 10 ps in each group, we"d need 20 participants. In within-group design each p hits both balls (e. g. , a then b: number of ps = 10, need fewer participants, controls for variability from individual differences. Solution 1: use a between-group design (but lose advantages of the within-group designs) Solution 1: use between-groups design (but lose advantages of within-groups design) Solution 2: use complete counterbalancing (but number of orders/sequences increases with number of conditions; x!) No, controls for order, not sequence: e. g. , in previous example: a follows b three times, b never follows a. Solution 4: use a balanced latin square (p. 255); control for order and sequence effects.