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 400°C after switching off. For a sample of 8...

Extracted text: 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 400°C after switching off. For a sample of 8 ovens the times in minutes are: Sample A 13.9 16.9 16.7 15.9 16.8 16.6 15.9 16.4 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 15.1 13.4 15 15.4 15.4 14.9 15.2 14.9 13.6 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 U2) Here are the critical values for n-8 and ny-9, for the two-tailed Mann-Whitney test 0.1 0.02 0.005 0.002 0.001 Alpha Level 0.2 0.05 0.01 Critical Value 50 54 57 61 63 65 67 68 What is the p-value for the test? Select an What is your conclusion after doing the test? Sect an Submit Question