Experimental Design 0.0 / 5 ? PsychologyResearch MethodsASAQA Created by: meganbradfield1Created on: 07-04-16 16:48 What happens in independent groups design? Pps allocated to 2 or more groups representing different experimental conditions. 1 of 12 Strengths of Independent groups. Randomly allocated so individual differences wont affect the results; no order effects; more pps tend to be used; high external validity; quick. 2 of 12 Weaknesses of Independent groups. Expensive as twice as many pps needed; cannot be sure of individual differences; pp variables not controlled. 3 of 12 What happens in repeated measures design? Same group of pps take part in every condition. 4 of 12 Strengths of repeated measures. Less pps needed so cost effective & quick; no risk of individual differences (pps compared against themselves). 5 of 12 Weaknesses of repeated measures. Order effects occur where a practice effect does; pps may guess aim & show demand characteristics in 2nd test. 6 of 12 What happens in matched pairs design? Pps are matched on similar characteristics and put into separate groups. 7 of 12 Strengths of matched pairs design. Individual differences are controlled; better suited when repeated measures leads to an order effect. 8 of 12 Weaknesses of matched pairs design. Time consuming; ID's may affect IV + internal validity; sample may be small so may lack external validity. 9 of 12 What is counterbalancing? Overcomes order effects and ensures that each condition is tested first or second in equal amounts. 10 of 12 What is the first way to counterbalance? Divide participants into group 1 (AB) and group 2 (BA) 11 of 12 What is the second way to counterbalance? All participants take part in each condition twice. 12 of 12
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