In an effort to reduce energy costs, a major university has installed more effic

Question

In an effort to reduce energy costs, a major university has installed more efficient lights as well as automatic sensors that turn the lights off when no movement is present in a room. Historically, the cost of lighting an average classroom for 1 week has been $265. To determine whether the changes have significantly reduced costs, the university takes a sample of 50 classrooms. They find that the average cost for 1 week is $247 with a standard deviation of $60. Therefore, the test statistic is 2.12. If the critical value is 1.96, what is your conclusion concerning the null hypothesis? Reject the null hypothesis Fail to reject the null hypothesis

Explanation / Answer

Given : test statistic = 2.12 Critical value = 1.96

Decision Rule : Here , test statistic = 2.12 > Critical value = 1.96

Therefore , Reject the null hypothesis

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