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Lecture%209%20%28March%2016%29 - GEOG GEOG2006 Statistical...

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GEOG 2006 Statistical GEOG 2006 – Statistical Methods in Geography Lecture 8 March 9, 2011
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L b 6 L b 8 Lab 6 versus Lab 8
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3b) Dependent two sample t test 3b) Dependent two sample t test Used when there are pairs in the same sample (i.e., dependent information) For example, a sample of students are tested before a certain educationalprogram, and the same group is tested after, to see if there is a difference in their test results Same individuals, but results are in pairs
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x t D d f 1 n s D = d.f. = n Example of repeated measures Difference Number Name Test 1 Test 2 1 Mike 35% 67% 32 2 Melanie 50% 46% 4 3 Melissa 90% 86% 4 4 Mitchell 78% 91% 12
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3a) Independent two sample t test 3a) Independent two sample t test The two sample test statistic (t or z) This test is used only 2 2 2 1 σ σ σ + = when the two population variances are assumed to 2 1 2 1 n n x x be different 2 1 x x t = The two sample sizes may or may not be equal and therefore m st be 2 1 x x σ and therefore must be estimated separately
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b Lab 7
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b Lab 8
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