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Statistics Test 2 Johnson
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16 Terms
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1
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r^2
Coefficient of Determination
2
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r
Correlation Coefficient
3
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...the line is a perfect positively sloped line.
If the r value is 1 then...
4
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...the line is a perfect negatively sloped line.
If the r value is -1 then...
5
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LinReg(ax+b) or LinReg(a+bx)
LSRL / Least Square Regression Line
6
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The difference between an actual value ( y ) and a predicted value ( y hat ). (y) - (y hat)
Residual
7
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Located below the LSRL
Negative Residual
8
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Located above the LSRL
Positive Residual
9
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Must be interpreted to help confirm a linear relationship.
Residual Plot
10
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Must have a "good" r value and a "good" residual plot
Linear Relationship
11
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Use technology or formulas for slope and y intercept from your formula sheet
Finding the LSRL
12
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Minimizes the sum of the areas formed by squaring the residuals.
Concept of the LSRL
13
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In bi-variate data, drastically changes the r value, slope, and y intercept
Influential Point
14
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Used to find a z score or location
invNorm
15
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Used to find an area / probability
normalcdf
16
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...always located on the LSRL.
The coordinate x bar, y bar is ...
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