An engineering supervisor randomly measured the calorific value of a combustible substance produced in a plant before and after the implementation of a quality improvement policy. The following random measurements were obtained: Before 8220 8096 7083 8852 8166 After 7762 7068 8437 8282 8822 Use the 0.05 level of significance to test whether the difference between the means of these two samples is significant. Instructions: Assume 8 = 0, in addressing the problem obtain the value of the test statistic and its corresponding p – value up to four decimal places. Ot = 0.0221; p – value = 0.4914 Ot%3D 0.0221; р-value 3D 0. 5086 Ot 3D 0.0221; р- value = 0. 2457 Ot = 0.0221; p – value = 0.9829

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