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Lecture #3.docx

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PSYC 1010
Rebecca Jubis

Lecture #3 Study Group Grade 0 hours sleep 65% 5 hours sleep 73% 10 hours sleep 65%  If hypothesis isn’t upheld, re-evaluate study Confounding variable -a variable that interferes with the results -It effects the dependent variable so that you don’t know whether the effects are caused by the independent variable, the confounding variable, or both. Alcohol effecting memory -Subject shouldn’t know how much they’re getting. Might influence behaviour -Groups should be equal in every way except the independent variable Make groups equivalent by: Random assignment: By using this, you are assuming that all individual difference variables are being evenly distributed among groups so that groups are essentially equal - Placebo control group is better, avoid having expectation as a confounding variable Correlational Method: - Measures the degree of relationshop between 2 variables. These is no attempt to manipulate or control variables - Rather naturally occurring variations are measured to see if they are related - Help us make predictions Scatter Plot Interpret what that # means about the relationship Correlational Coefficient: strength of relationship between variables r = + or - number Direction of relationship  Impossible to get # higher than 1 ex. Grade and fatigue 1 = perfect 0.9 0.8 = strong 0.7 0.6 0.5 0.4 0.3 0.2 0.1 = weak
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