Unit 3: Inferential Statistics
3.1 Standard Scores (z-scores)
|A z-score is an individual score in terms of standard deviations, and indicates percentile rank (see the z-tables).|
3.2 Correlation (Pearson)
|A correlation indicates strength and direction of the relationship between two variables, does not indicate causation, but allows us to make predictions.|
3.3 Coefficient of Determination
|Indicates how much variance of one variable can be explained by another variable. If r = 0.84, then r-squared = 0.71, indicating that 71% of the variance of one variable can be explained by the other variable.|
3.4 Multiple Correlation
|Allows us to use more than one variable to predict another variable.|
3.5 Linear Regression
|Calculate a regression line to make a precise prediction.|
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