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?
What will be an ideal response?
?
| a. | 31.25 |
| b. | 61.25 |
| c. | 2438.75 to 2561.25 kWh |
Business
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