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 signficantly reduced costs, the university takes a sample of 93 classrooms. They find that the average cost for 1 week is $244 with a standard deviation of $74. When testing the hypothesis (at the 1% level of significance) that the average energy use has decreased from the past, what is the critical value? (please round your answer to 2 decimal places)

Given: In an effort to reduce energy costs, a major university has installed more efficient lights…

Answered: In an effort to reduce energy costs, a…

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

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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 signficantly reduced costs, the university takes a sample of 93 classrooms. They find that the average cost for 1 week is $244 with a standard deviation of $74. When testing the hypothesis (at the 1% level of significance) that the average energy use has decreased from the past, what is the critical value? (please round your answer to 2 decimal places)

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