An article in cancer research [“analyses 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: 101, 104, 104, 77, 89, 88, 104, 96, 82, 70, 89, 91, 39, 103, 93, 85, 104, 104, 81, 67, 104, 104, 104, 87, 104, 89, 78, 104, 86, 76, 103, 102, 80, 45, 94, 104, 104, 76, 80, 72, 73 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