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9 Cards in this Set
- Front
- Back
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Describing association |
D- direction U-unusual F-form U S-strength |
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Correlation |
-a linear association between 2 variables -not between categorical -r -moderate strength is between .4 and .7 -in context: "for every 1 standard deviation increase in (x) we can expect a (r) standard deviation increase in (y)" |
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Residuals |
-Difference between y-^y (y=original y; ^y= line model) - *Calc* 1. New list resid 2. Stat plot change y to RESID 3. Zoom stat |
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R^2 |
-change to percent -context: "(percent) of the variation in (y) can be explained by variation in (x)" |
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Line of regression (least squares regression line) |
Y hat=b0+b1x |
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b1 |
B1=r(Sy/Sx) |
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Sy or Sx |
Standard deviations of all y's or all x's |
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b0 |
b0=ybar(mean of y's)-b1xbar(mean of x's) |
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Y=a+bx |
a: y-intercept (context: according to the model, the (y) predicted is (a)" b: slope (context: according to the model, (y) increases or decreases about (slope) every (interval)) |
