It's a 3 part question A, B, C

Suppose the following table illustrates the ages for a number of participants projected to enroll into a clinical trial looking at early onset of dementia. Patie Ag A) Assuming that these participants can be considered to be normally distributed, and that they come from a population a 0 4.3 years, calculate a 99% confidence interval for the mean age of the population for which they represent B) With the same assumptions listed above, calculate a 90% confidence interval for the mean age of the population for which they represent. C) Compare the precision of the two confidence intervals. A) (54.81, 62 25) B) (55.22, 60.99) C) The 99% CI is much narrower than the 90% CI A) (55.48, 64.52) B) (57.11, 62.89) C) The 99% CI is much wider than the 90% CI A) (62.48, 75.52) B) (61.11, 65.89) C) The 99% CI is much wider than the 95% CI