Question 4 1 p You measure the lifetime of a random sample of 25 rats that are exposed to 10 Sv of radiation (the equivalent of 1000 REM) for which the LD 100 is 14 days. The sample mean is a= 13.8 days. Suppose that the lifetimes for this level of exposure follow a Normal distribution with unknown mean ( and standard deviation o = 0.75 days. A 85% confidence interval for / is 13.034 to 13.906 13.584 to 14.016 13.483 to 14.016 13.483 to 13.916 1 pts Question 5 1 MAY