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Confidence levels and relevant probabilities

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Hypothetical Data for Kil-EZ Carcinogenicity Test

Number of test rats Number of rats with tumors Rat test dose in mg Kil-EZ per kg rat body weight (mg/kg/day) Probability of a rat's developing tumors Lower 95% confidence level Upper 95% confidence level
50 1 0 .02
50 5 20 .10
50 10 40 .20
50 20 80 .40
50 7* 160 .14

Calculate the 95% confidence intervals for each of the relevant probabilities in your Table, and insert into the fifth and sixth columns of the Table.

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Confidence levels and relevant probabilities are discussed.

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