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QMP Unit 3
Question | Answer |
---|---|
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 |