Lecture 5 - Contingency Tables chi-square testing...

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Contingency Tables chi-square testing
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Announcements Assignment #2 due today by 10pm Drop in drop box in pdf form Midterm 1 Exam conflicts: email [email protected] Notify us one week in advance of exam University excused absences only!
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Effectiveness of Plavix Heart Attack No Heart Attack Total Plavix 584 5697 6281 Placebo 720 5561 6281 Total 1304 11258 12562
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Hypothesis H 0 : Proportion of heart attacks is the same in both groups H a : Proportion of heart attacks is different in the two groups
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Type I Error Type I error Truth: Plavix and placebo are the same Sample leads to conclusion: Plavix and placebo produce different rates of subsequent heart attacks What is the cost?
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Type II Error Type II error Truth: Plavix and placebo produce different rates of subsequent heart attacks Sample data leads to conclusion: Plavix and placebo are the same What is the cost?
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Which mistake is more costly?
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