Quantitative Methods 2017

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Example: Contingency tables
Observed Toxicity No Toxicity Total
Treatment A 30 70 100
Treatment B 40 60 100
Total 70 130 -
Expected Toxicity No Toxicity Total
Treatment A 35 65 100
Treatment B 35 65 100
Total 70 130 -
=2.2 P=0.14