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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).
the central economic problem facing the group of survivors
Shambles have selected the "Mythical Beasts" range and decided to concentrate on "Pegasus" and "Phoenix." They would now like to find the right mix of these two products in order
Cornell University conducted a study of wage differentials between men and women reported that one reason that men's wages are higher is that men tend to have more years of work ex
An owner can lease her building for $100,000 per year for the next three years. The explicit cost of maintaining the building is $35,000, and the implicit cost is $50,000. All reve
The rate of interest in the UK also showed very interesting results, to an impulse shock on oil price. The middle left graph from Fig 4.4 shows the results. Initially, in the short
Critically examine Say''s law of market
Explain the term- inventory investment We would have a negative inventory investment whenever inventories decrease. By net investments we mean gross investments minus depreciat
Rewrite the national-income model (3.23) in the format of (4.1), with Y as the first vari¬able. Write out the coefficient matrix and the constant vector.
Q. Show the Destruction of capital? Destruction of capital, for instance, through a war, works in the opposite way. Marginal product of labor falls, GDP per capita falls and po
You have a choice between a lottery lump sum payout of $10,000,000 today or a series of 25 annual annunity payments the first payment will be one year from today ad a discount rate
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