Example: confidence
Syntax - Stata
Pr(C < c) = 0.9717 2*Pr(C > c) = 0.0565 Pr(C > c) = 0.0283 Example 2: Variance ratio test We are testing the effectiveness of a new fuel additive. We run an experiment on 12 cars, running each without and with the additive. The data can be found in[R] ttest. The results for each car are stored in the variables mpg1 and mpg2:
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