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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 signficantly reduced costs, the university takes a sample of 117 classrooms. They find that the average cost for 1 week is $247 with a standard deviation of $74. When testing the hypothesis (at the 5% level of significance) that the average energy use has decreased from the past, what is the test statistic? (please round your answer to 2 decimal places).
why is international trade important for South Africa?
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If there are economies of scope and if the price for each product equals marginal cost, is it possible for a firm to cover all its costs? If the firm's average cost of production d
Which of these variables are discrete and which are continuous random variables? a) The number of new accounts established by a salesperson in a year. b) The time between customer
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