# Statistics Test 2 Johnson

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16 Terms
ðŸ˜ƒ Not studied yet (16)
r^2
Coefficient of Determination
r
Correlation Coefficient
...the line is a perfect positively sloped line.
If the r value is 1 then...
...the line is a perfect negatively sloped line.
If the r value is -1 then...
LinReg(ax+b) or LinReg(a+bx)
LSRL / Least Square Regression Line
The difference between an actual value ( y ) and a predicted value ( y hat ). (y) - (y hat)
Residual
Located below the LSRL
Negative Residual
Located above the LSRL
Positive Residual
Must be interpreted to help confirm a linear relationship.
Residual Plot
Must have a "good" r value and a "good" residual plot
Linear Relationship
Use technology or formulas for slope and y intercept from your formula sheet
Finding the LSRL
Minimizes the sum of the areas formed by squaring the residuals.
Concept of the LSRL
In bi-variate data, drastically changes the r value, slope, and y intercept
Influential Point
Used to find a z score or location
invNorm
Used to find an area / probability
normalcdf
...always located on the LSRL.
The coordinate x bar, y bar is ...