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Question: In problem, suppose that the population standard deviation is 1.0 and that the true average reduction in consumption for the entire population in the area is µD = 0.1. For a sample size of 60 and α = 0.01, what is the power of the test?
Problem: A study is undertaken to determine how consumers react to energy conservation efforts. A random group of 60 families is chosen. Their consumption of electricity is monitored in a period before and a period after the families are offered certain discounts to reduce their energy consumption. Both periods are the same length. The difference in electric consumption between the period before and the period after the offer is recorded for each family. Then the average difference in consumption and the standard deviation of the difference are computed. The results are D¯ = 0.2 kilowatt and sD = 1.0 kilowatt. At α = 0.01, is there evidence to conclude that conservation efforts reduce consumption?
Findout the variance also standard deviation for the 2 distributions above. Evalute the variation of the data sets.
assume that the salaries of full-time staff from the education department at your school have a normal distribution. a
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A mean of 400 labour hours and a standard deviation of 100 labour hours. What is the probability that the bridge gets constructed between 350 and 450 hours?
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Suppose a geyser has a mean time between eruptions of 68 minutes. Let the interval oftime between the eruptions be normally distributed with standard deviation 26minutes. (round everything to four decimal places)
Using the preceding data, compute pension expense for the year 2014. As part of your solution, prepare a pension worksheet that shows the journal entry for pension expense for 2014 and the year-end balances in the related pension accounts.
in conducting a survey what do you think is even more important than the size of the sample?
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