16. The following data, in stem-and-leaf notation, are a sample of heights of juvenile patients in a hospital. Height in centimetres 10 89 11 33466 12 5667899 13 122588899 14 577 15 2358889 16 22578 17 13 mean height = 140.025, 5 = 18.838704? Write down a 95% confidence interval for the overall mean height of juvenile patients. Since the data do not appear to come from a normally-distributed population, what justifies the use of the formula giving the answer to a)? Test at the 5% level whether the mean height of juveniles is significantly less than 150 cm