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1. In order to estimate the average electric usage per month, a sample of 196 houses was selected and the electric usage determined. a. Assume

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1. In order to estimate the average electric usage per month, a sample of 196 houses was selected and the electric usage determined. a. Assume a population standard deviation of 330 kilowatt hours Determine the standard error of the mean. D. With a 0.9_ probability, determine the margin us error C. .. the sample mean is 4,000 KWH, what is the 95% con idence interval estimate of the population mean

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