AP Statistics Written Interpretations and Templates

[Pages:4]AP Statistics Written Interpretations and Templates

*** Note: All conclusions and interpretations must be connected to the context of the problem.

Interpretation of R-Squared (use R-Squared when asked about strength/reliability of the model) (Remember to check sign if calculating from a computer printout) _____% of the variability in _____ can be explained by the linear association between _____ and _____. (y, y, x)

Interpretation of r (correlation coefficient) This is the correlation and has strength and direction. You must address both of these. (r is NOT a %... do not confuse r with R-Squared).

Interpretation of Slope The model predicts that _____ (y) will change by approximately _____ (the slope) as _____ (x) increases by 1 (units) on average.

Residual Actual ? predicted OR observed ? expected

Confidence Interval I am _____% confident that the true _____ (mean/proportion) is between _____ and _____.

Confidence Level If I repeated this process again and again I would capture the true _____ (mean/proportion) _____% of the time in the various intervals.

Concluding a Statistical Test (Inference) Two sentences... the first states the p-value and whether or not you reject the null (is the pvalue small? ................
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