05,9in the t‐table (Table 3 in "Statistics Tables"), which gives a critical value of 1.833. Because this is a one‐tailed test, the alpha level (0.05) is not divided by two. The degrees of freedom parameter is the smaller of (12 – 1) and (10 – 1), or 9. Two randomly chosen groups are tutored separately and then administered proficiency tests. The number of degrees of freedom for the problem is the smaller of n 1– 1 and n 2– 1.Īn experiment is conducted to determine whether intensive tutoring (covering a great deal of material in a fixed amount of time) is more effective than paced tutoring (covering less material in the same amount of time). Where and are the means of the two samples, Δ is the hypothesized difference between the population means (0 if testing for equal means), s 1 and s 2are the standard deviations of the two samples, and n 1and n 2are the sizes of the two samples.
Two Sample t test for Comparing Two Means.Quiz: Two-Sample z-test for Comparing Two Means.Quiz: Introduction to Univariate Inferential Tests.
Two-Sample z-test for Comparing Two Means.Quiz: Point Estimates and Confidence Intervals.Point Estimates and Confidence Intervals.Quiz: Normal Approximation to the Binomial.Quiz: Populations, Samples, Parameters, and Statistics.Populations, Samples, Parameters, and Statistics.Quiz: Introduction to Numerical Measures.
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