In order to estimate the average electric usage per month, a sample of 256 houses was selected and their electric usage was determined.Assume a population standard deviation of 500 kilowatt-hours.
a.
Determine the standard error of the mean.
b.
With a .95 probability, determine the margin of error.
c.
If the sample mean is 2500 kWh, what is the 95% confidence interval estimate of the population mean?

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The Answer of In order to estimate the average electric usage per month, a sample of 256 houses was selected and their electric usage was determined.Assume a population standard deviation of 500 kilowatt-hours.
a.
Determine the standard error of the mean.
b.
With a .95 probability, determine the margin of error.
c.
If the sample mean is 2500 kWh, what is the 95% confidence interval estimate of the population mean?

In Order to Estimate the Average Electric Usage Per Month