Solution-If the sample mean is 2000 kwh what is the 95

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?

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