EXPERIMENTAL PSYCHOLOGY PSYC 302
U of L
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This 3 page Class Notes was uploaded by Ayden McLaughlin IV on Friday October 23, 2015. The Class Notes belongs to PSYC 302 at University of Louisville taught by Lora Haynes in Fall. Since its upload, it has received 13 views. For similar materials see /class/228368/psyc-302-university-of-louisville in Psychlogy at University of Louisville.
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Date Created: 10/23/15
experimental design Reading experimental strategy ch7 pg196 216 internal and external validity ch6 pg167 191 between subjects design ch8 pg228 238 factorial designs ch11pg310 317 no chapter9 experiments Experimentation process for testing a prediction hypothesis Prediction 2 types of hypotheses 1 directional hypothesis predict which team will win 2 non directional simply stating that teams will perform differently in this game IV what is manipulated by the experimenter DV outcome must define in a measurable way experimental control is outcome of experiment explained by anything other than IV random assignment make sure groups are equivalent no differences on some preexisting characteristic assigning participants so that each has equal probability of being placed in conditions Classic examples Stanley schacter 1959 anxiety and affiliation making people anxious by telling them they are going to shock them to see if they wanted to be with people What is IV and DV DV affiliation depends on anxiety level Vitamin C study Posttest only control group design Equivalent control experimental groups administer treatment vitamin c Radom assignment minimizes pre existing differences between groups two groups should be as alike as possible Confounds lack of control over some variables ex amount of sleep Maximizing internal validity ofthe study extent to which results are due to manipulation of IV Threats to internal validity environmental size of room time of day temp of room gender of experimenter Drop outsattrition those who drop out may be different from those who complete the study experimenter bias dull rats bright rats example minimize by standardize procedures and instructions written instructions computerized administration Experimenter does not know status of subjects Best way double blind experiment subjects don t know what condition they are in AND experimenter does not know external validity apply to anyone beyond participants Beyond laboratory rats college students College students more varied now than in past many common principles of behavior operate across species Experimental design between subjects design different subjects take part in each condition make comparisons between different groups of subjects how many subjects The larger number the better but there are practical limits also statistical limits to how much is gained by increasing sample size Power ability to distinguish group differences given a particular sample size smaller sample size less power 1randomly selects subjects 2placed into one of the two conditions randomly assigned Two step process Step 1 choose subjects Step 2 randomly assign subjects from step 1 into groups Random selection and random assignment are different Non random selection messes up external validity Non random assignment messes up internal validity Between subjects variation experimental control group aerobics example To be a good control condition have subjects do something similar Matched groups what if potential confound so important you want to control for it up front try to prevent confound might be better than just random assignment ex IQtest matching with memory ability 3rank ordered matching just lists subjects in order of score When matching need to be sure matching variable is highly related to dependent variable
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