# GGR270H1 Midterm: Two Sample Means Test

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10 Dec 2010
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## Document Summary

Used when the objective is to compare two samples. You are testing whether there is a significant difference between two samples. If the sample differences are significant, then statistical inference allows the researcher to conclude that the samples are drawn from different populations: hypotheses. H0: no significant difference between the mean of sample 1 and the mean of sample 2. Therefore, the samples are drawn from the same population. Ha: there is a significant difference between the mean of sample 1 and the mean of sample 2. Therefore, the samples are drawn from different populations: critical value. Two forms of this test arise: (a) variances are equal (b) variances are unequal. 1 (b) variances are not equal: decision rule. (a) variances are equal. Is employment change in the manufacturing core of a region greater than that in the periphery? n1 = 22 cities (core region) n2 = 27 cities (periphery)