Hotpot stoves use a standard oven insulation. To test its effectiveness they take random samples from the production line and heat the ovens selected to 400C after switching off. For a sample of 8 ovens the times in minutes are: Sample A 15.9 14.6 15.8 16.1 14.6 16.3 16.2 13.8 They decide to explore a cheaper insulation and using this on a sample of 9 the times taken for the same temperature drop are Sample B 14.5 13.9 15.1 14 14.3 15.1 15 14.8 13 Are the firm justified in asserting there is no real evidence of a different rate of heat loss? What is the Mann-Whitney U statistic (report the larger of U and U) Here are the critical values for n-8 and n-9, for the two-tailed Mann-Whitney test Alpha Level 0.2 0.1 0.05 0.02 0.01 0.005 Critical Value 50 54 57 61 63 65 67 0.002 0.001 68 What is the p-value for the test? Select an answer What is your conclusion after doing the test? Select an answer