AP Statistics - Unit 3 Stuff

LSRL equation and how to solve each part

y = bo + b1x

bo = r(sy/sx) (slope)

b1 = y - b1x (y-int)

Standard Deviation of the Residuals Interpretation

The actual [y-context] is typically about [s (y-units)] away from the [context] predicted by the LSRL.

Coefficient of Determination Interpretation

About [r²]% of the variability in [y-context] is accounted for by the LSRL.

Residual interpretation

The actual [y-context] was [r] higher/lower than predicted for [x-context/value].

Y-intercept Interpretation

When [x = 0 context], the predicted [y-context] is [y-int].

Slope Interpretation

With each additional [x-context], the predicted [y-context] increases/decreases by [slope].

An object is influential if…

…removing it would change the result of the calculation. (aka see if it changes the equation of the line with calculator, and if it does exponentially, then the point is influential)