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QMP Unit 3

QuestionAnswer
correlation how related the variables are, not about causality
linear correlation the degree to which a straight line best describes a relationship
3 classes of correlation positive, negative, zero
positive high scores for one variable is associated with high scores with the other
negative scores are inversely related
zero no correlation at all
strength how strong the relationship is between variables
pearson product moment correlation coefficient r
positive above zero
negative below zero
strong .7-1 and -.7- -1
moderate .3-.7 and -.3 - -.7
weak -.3 - .3
coefficient of determination (r2) amount of variation in one variable that is accounted for by variance in second variable
Chi Square is there a significant difference between people or is it due to chance?
one variable goodness of fit test
chi square test for independence are variables tied together or independent of each other
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