Statistics Test 2 Johnson
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Last updated 5:28 PM on 10/24/22
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16 Terms
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r^2
Coefficient of Determination
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r
Correlation Coefficient
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...the line is a perfect positively sloped line.
If the r value is 1 then...
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...the line is a perfect negatively sloped line.
If the r value is -1 then...
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LinReg(ax+b) or LinReg(a+bx)
LSRL / Least Square Regression Line
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The difference between an actual value ( y ) and a predicted value ( y hat ). (y) - (y hat)
Residual
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Located below the LSRL
Negative Residual
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Located above the LSRL
Positive Residual
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Must be interpreted to help confirm a linear relationship.
Residual Plot
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Must have a "good" r value and a "good" residual plot
Linear Relationship
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Use technology or formulas for slope and y intercept from your formula sheet
Finding the LSRL
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Minimizes the sum of the areas formed by squaring the residuals.
Concept of the LSRL
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In bi-variate data, drastically changes the r value, slope, and y intercept
Influential Point
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Used to find a z score or location
invNorm
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Used to find an area / probability
normalcdf
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...always located on the LSRL.
The coordinate x bar, y bar is ...
