Short Answer
In order to estimate the average electric usage per month, a sample of 196 houses was selected, and their electric usage determined.
a.Assume a population standard deviation of 350-kilowatt hours. Determine the standard error of the mean.
b.With a 0.95 probability, determine the margin of error.
c.If the sample mean is 2,000 KWH, what is the 95% confidence interval estimate of the population mean?
Correct Answer:
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a.25
b.49
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Correct Answer:
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b.49
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