ANTC67H3 Lecture Notes - Odds Ratio, Null Hypothesis, Statistical Significance

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17 Dec 2012
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In a case control study, researchers examined the association between exposure to electromagnetic fields and the development of childhood leukemia. The researchers were able to recruit a total of 250 participants. Of the 120 children with leukemia, 28 reported to have exposure to electromagnetic fields. In the control group, 12 had reported to have exposure to electromagnetic fields. * this is always the set-up for the table, do not switch up things, you will get the wrong answer if not in this format. Or : we want to test if this difference is statistically different. Ho = there is no relationship between the exposure and developing leukemia; or = 1. Ha = or not equal to 1: we use mantel-haenszel chi-square test to assess statistical significance of odds ratios. When p<0. 05, our cv (critical value) = 3. 84. Reject ho if x2 = (or greater than) 3. 84. Antc67 tutorial #5: calculate the test statistic using the chi-square formula.

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