An article in Cancer Research [Analyses of Litter- Matched Time-to-Response Data, with Modifications for Recovery of Interlitter

An article in Cancer Research [€œAnalyses of Litter- Matched Time-to-Response Data, with Modifications for Recovery of Interlitter Information€ (1977, Vol. 37, pp. 3863€“ 3868)] tested the tumorigenesis of a drug. Rats were randomly selected from litters and given the drug. The times of tumor appearance were recorded as follows:

Calculate a 95% confidence interval on the standard deviation of time until a tumor appearance. Check the assumption of normality of the population and comment on the assumptions for the confidence interval.

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