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A contractor wishes to lower heating bills by using a special type of insulation in houses. If the average of the monthly heating bills

A contractor wishes to lower heating bills by using a special type of insulation in houses. If the average of the monthly heating bills is $87.Given the following data: sample mean of $87, population standard deviation of 4 and sample of 36. a. Formulate the hypothesis Ho and HA Then Test the hypothesis using alpha of 0.05. b) Calculate the p-value approach. Interpret the result.

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