QUESTION 4 According to a dietician, adult South African men are on average more than 10kg...
QUESTION 4 According to a dietician, adult South African men are on average more than 10kg overweight. To test this statement, twenty South African men are chosen at random. Their weights (kg) are measured and their respective ideal weights subtracted. The results are: 8 115 9 20.5 11 9 115 9 17.5 9 17.5 8 7.5 8.5 9.5 15 7.5 8 13 It follows that х = 10.4kg and s = 33896kg. Investigate the statement of the dietician. (a) With a 95% confidence interval, write down the formula and calculate the realised interval estimate. (b) Test the dietician's claim at the 2.5% level of significance. (10)