Question: 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

1. In order to estimate the average electric usage per month,

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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