In a random sample of 60 boxes of strawberries, the average number of strawberries per box is 150. The 96% confidence interval for the mean number of strawberries per box is given as 142 to 158. a) Find the value of standard deviation that was used to calculate this CI. b) Assume that the number of boxes per sample is doubled, and a new confidence interval is calculated at the same confidence level. Derive (show your work in terms of symbols) and then width of 96% C1 (using doubled sample size) evaluate an ex ression for the ratio . p width of 96% CI (using original sample size)