Quantitative Methods 2017

14-15 / 1676

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 -
Assume null hypothesis: Equal toxicity