AP Statistics Sentence Answers

Direction

positive/negative/none

Unusual Features

outliers

Form

linear/nonlinear

Strength

weak/moderate/strong

Interpreting correlation ®

The linear relationship between explanatory variable and response variable is strength and direction.

Interpreting coefficient of determination (r²)

R² percent of the variation in the response variable is explained by the linear relationship with explanatory variable.

Residuals

The actual context was residual above/below the predicted value for x = #.

Y-int

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

Slope

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

Standard Deviation Interpretation

The context typically varies by SD from the mean of MV

Z-score

context is z standard deviations above/below the mean

Shape

symmetric, skewed, bimodal, unimodal

Outlier

IQR Rule

Center

mean for symmetric distributions or median for skewed distributions

Spread

range for when you can’t find SD or IQR; IQR for normal and SD for skewed