Psych 100B Notes

Psych 100B Notes - 6/1/2009 12:07:00 AM Correlation:...

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Unformatted text preview: 6/1/2009 12:07:00 AM Correlation: Predictor variable: TV violence Critierion variable: Aggressive Behavior 2 variables positive correlation negative correlation or it can be unrelated [-1,+1] -1 is negative correlation +1 is positive correlation CORRELATION CANNOT DETERMINE CAUSE A B B A directionality problem Third variable problem C can be causing A and B Ie. The number of times you have sex per week and how young you look o Dont know which is exactly the cause o Dont know if theres another variable People who sleep less than 6 hours a night are more likely to develop eating disorders Predictor: sleep Criterion: eating disorder Impatient parents tend to have children who demand a lot of attention Predictor: impatient parents Criterion: demanding children As the economy is getting worse, consumers have cut back on drinking in bars but are spending more on alcohol to drink at home two statements combined into one Predictor: Worsening economy Criterion: cutting back on drinking in bars Predictor: worsening economy Criterion: spending more alcohol to drink at home TRUE experiment is the ideal design need to know that X comes first and then Y and eliminate all other causal factors manipulate on variable variables: manipulated variable, measured variable, control everything else CAN MAKE CAUSAL CONCLUSIONS Manipulated variable independent variable Measured variable dependent variable Things controlled Extraneous variables o Ie. With the TV and aggression study Want to manipulate how much violent TV they watch randomly assign children to groups set up how much TV each group watches and then measure how aggressive each child is need to define what aggressive behavior is in a child: verbal and physical IN GENERAL, VARIABLE IS A CONSTRUCT NEED TO TURN CONSTRUCT INTO OPERATIONAL DEIFINITION Construct: study Operational definition: look at the notes, summarize, Belief vs. Scientific hypothesis A hypothesis has to have a relationship at least Correlation o One variable can predict another variable o E.g. women drinking more than 3 cups of coffee a day took more than 1 year to conceive Variable: lookin at amount of coffee drinking and amount of time it takes to get pregnant Does drinking coffee cause infertility? Not necessarily Dependent on directionality and third variable o 3 rd variable: e.g. stress manipulate area of interest measure behavior control everything else Operational definition o How do you define a cup of coffee How many ounces 6/1/2009 12:07:00 AM Lecture outline: Independent Variable Manipulate o Levels o Quantitative vs. qualitative o Range o Operational definition Dependent Variable Measure Types o Self report o Behavorial o Physiological Scales Operational Definition Scales Nominal Ordinal Interval Ratio...
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Psych 100B Notes - 6/1/2009 12:07:00 AM Correlation:...

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