m 3. A random sample of size 16 is taken from a normal population with mean . If the sample mean is 68 and the sample standard deviation is 8. (a) what distribution is used to find critical value of 95% CI? Ot-distribution Normal distribution Binomial distribution z, the standard normal distribution (b) Compute a 95% upper confidence bound for :(Not upper limit of 95%CI) (enter your answer in 3 decimal places)