The age of a sample of 17 asthma patients is given by the following list: 18 21 21 22 25 27 31 34 37 39 46 47 48 53 54 63 65 The sample mean is 38.29412 and sd=15.14416

a. Draw a histogram or a normal quantile plot of the data and comment on interesting features of the data. Is there a large departure from normality? Can you assume the population is normal?

b. Calculate a 95% two-sided confidence interval for the mean age of asthma patients. Which interval is appropriate?