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Midterm

PSYC 217 midterm 2.pdf

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Department
Psychology
Course
PSYC 217
Professor
Catherine Rawn
Semester
Fall

Description
OCTOBER 3 Questionnaire design chapter 7 p 124131 Cozby find an example of survey LEARNING OBJECTIVEExplain basic repeated measures designExplain how counterbalancing enables detection of an order effectIdentify strengths and weaknesses of repeated measures designsDistinguish sources of systematic error vs random errorCompare repeated designs vs independent groups designs in terms of how they account for systematic sources of errorDiscuss how strength of IV and sensitivity of DV may influence choice of repeated measures design Repeated measures design within subjectssame participants experience all levels of the independent variableEg Hypothesis mood influences the degree to which people engage in critical thinking o DV critical thinking critiquing an essay o IV mood levels happy and sad o Possible design optionsIndependent groups betw groups12 participants happy mood inductionin sadAll critique paperCompare avg critique depthRepeated measures within groupAll participants in BOTH conditionsAll critique the paperCompare avg critique depthDiscussion1 What are 3 potential challenges researchers would face when using repeated measures design o Order effects o 1 Fatigue effect getting worse at it just because youre tired o 2 Practice effect improving scores over time just because youre getting better at it o 4 Contrast effects by being in one conditions will mess up experience in other conditionCounterbalancing o Mortality o Length of time interval o Dealing with counterbalancing orders2 Can you think of a research question where repeated measures design would be useful o Explain your idea o Why o hint used a lot in cognitive such as visual perception and in developmentalBenefits o Need fewer participants o More power to see the effect of IV on DVPotential problematic effects in repeated measure designs o Order carryover effectsWhenever a participantss response in a given condn is affected by having previously participated in other condn in that expThe effects of one cond carry over to othersTypesFatiguepracticecontrast o participant interprets one level of IV differently because of having participated in other level of IV o which experimental design has the greatest potential for a contrast effectA DV amt of punishment givenIV read about interrogation at Guantanamo Bay vs failing to pay rentB DV amt of punishement giveIV read about failing to pay phone bill vs failing to pay rentC DV speed of countingletter in sentence IV read about interrogation at Guantanamo Bay vs failing to pay rentANSWER Ait matters what the IV and DV areMeasuring order effects usingcounterbalancing participants get this order o Sad condncritique paper avg score 5happycrtique paper score 8 o Happycritique 8 sad critique 5 o No contrast effect here REPEATED MEASURES BETTER AT HELPING US IDENTIFY THE CONTRIBUTION OF OUR IV TO EXPLAINING VARIABILITY TO DV Sources of variability affecting participants scores on the DVConceptual IVerrorscore on DVError sources of variability in your measure caused by things other than your conceptual IVrepeated measures allows to divide into random error and systematic error can measure and sep systematic error only with repeated measuresRandom error o Misreadingmisunderstanding questions o Time of day o Recording error o affects reliabilitySystematic erroro Systematically decreaseincrease score on DV o Participants response biases eg Upper vs lower scale end o Individual differences in rxn time generally fastslow o Confounds o threatens construct validty repeatable so repeated design allows to repeat systematic error and toss it out What causes participants score on DV to differ from each other1 IV2 Random error3 Systematic error RatioOut of all the variability in the DV scores what proportion is attributable to the IVThe more random variability in DV the harder it is to detect the effect of the IVpie charts on slide OCTOBER 5 LEARNING OBJECTIVESCompare repeated measures designs vs independent groups designs in terms of how they account for systematic sources of errorDiscuss how strength of IV and sensitivity of DV may influence choice of repeated measures designCritically evaluate survey questions using terms from course The ratioOut of all the variability in the DV scores what proportion is attributable to the IVThe more random variability in DV the harder it is to detect the effect of the IVIndependent groups design variability pie graph vs repeated measures design see slide o Repeated measures we have error but its repeatable so can remove the systematic error Why bother with repeated measures designHelp identify effect of IV on DV
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