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Lecture 3

Lecture 3 - Reseach Methods and Errors within.docx

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PSYC 1010
Jill Bee Rich

PSYC 1010 Lecture 3: Variable Work Experimental Method Confounding Variables  Confounding variables make all of the work done in a study absolutely useless o This is a variable that interferes with the results that affects the dependent variable and thus we do not know if the Independent variable is the cause for the dependent variable, or if it’s the confounding variable o I.E. 3 groups studying for different times vs. test scores  If your data does not comply with your hypothesis, one should look at all the data and figure out if there is a reason for this or if the data is correct and your hypothesis is incorrect. o In our example, we must also look at sleep, this is the confounding variable  Unfortunately, often the confounding variable is never found o If it is found, one can manipulate this variable as independent, and have a study with two independent variables  In the “drinking” example of last lecture, expectation is called a confounding variable Random Assignment  By randomly assigning, you’re assuming that all individual difference variables are evenly distributed among groups such that groups are essentially equal. Correlational Method  Measures the degree of relationship between two variables. Naturally occurring variations on both variables are measured to see if they are related  Helps predictions  The data is placed into a formula o The correlation coefficient is calculated. -1 < r < 1  The posit
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