collier

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1. Correlations
• are "measures of association"
• a measurement of linear (straight line) relationship
2. measure of association
• a number that measures how related two variables are
• when two variables are related, this means that when one changes, the other changes
3. Pearson's product moment correlation
• the most common correlation
• referred to as "the correlation"
• it is used with quantitative (numerical) variables
• the symbol is r
4. Linear relationship
• most common
• correlation lies between -1 and 1
• the measure of how close the points in the scatterplot are to the best fitting straight line
• it's negative when the line goes down, positive when the line goes up, and 0 when the line is flat
5. regression line
the best fitting straight line
6. square of correlation
• r2
• sometimes called "variance accounted for" or "shared variance"
• it is interpreted as the amount of variance in the y variable accounted for by the x variable
7. residual
error in the prediction
8. regression and correlation
• yeild three important numbers:
• slope of best fitting line
• intercept of best fitting line
• correlation
 Author: brittanyball42 ID: 175410 Card Set: collier Updated: 2012-10-04 01:55:19 Tags: chp 2` Folders: Description: chp 3.2 Show Answers: