help please

Q3 (34 marks) The ascorbic acid (mg per 3 hours) was recorded for 18 students who live and dine in a hall and 13 students who live and dine at home. The results were : Hall 22 38 63 70 28 81 37 37 53 37 27 14 9 28 20 16 37 34 Home 54 48 98 47 83 172 96 155 22 163 205 89 50 (i) At 5% significance level test for a difference in the variances of the two groups? (ii) Is there a signicant difference between the mean ascorbic acid in the two groups of students? (iii) Provide a 95% condence interval for the true average difference and compare the result with the one presented under point (ii) Q4 (21 marks) The time (in minutes) taken to complete a task of a particular type were recorded for a sample of fifteen employees before and after a period of training as follows: Employee 2 4 5 6 7 8 LO 10 11 12 13 14 15 Before Training 15 14 18 14 15 17 13 12 19 20 18 19 18 17 16 After Training 11 15 15 13 12 16 14 12 11 15 11 11 19 19 17 The management wants to know whether the training has been effective. At a 5% level of significance test whether the training has been effective