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HUMA 1125 (23)

PSYC 1010 lectue notes September 20, 2012.docx

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HUMA 1125
Marcia Bell

September 20, 2012 Psychology - Placebo test group – test question - One variable you don’t want: Confounding, it screws up research - We want to say independent variable effects the dependent variable - Confounding variable - is a variable that interferes with the results of your study. It affects the dependent variable so you don’t know whether the effect is caused by the independent variable, by the confounding variable, or by both. - Try to prevent a confounding variable from the beginning - Random Assignment – By using this, you are assuming that all “individuals difference” variable, are being evenly distributed among groups so that the groups are the same - Larger the sample them more effective it is - 4. Correlational Method – Measures the degree of relationship between 2 variables. There’s no attempt to manipulate or control variables. Rather naturally occurring changes on both variables are measured to see if they’re related. Help us make predictions. - Measure what already exists (Give students a rating of how tired they are. See test marks and compare with others - Scatter plot with dots all over the place show that there is no correlation between 2 variables - The closer the line the stronger the relationship - Correlation Coefficient R = + or –, number - + or – means direction of the relationship - Number is the strength of the relationship - + means the values of both variables are changing in the same direction -
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