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Home Q & A Board Science-Related Homework Help Mathematics
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Theleeman Theleeman
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6 years ago
In order to estimate the average electric usage per month, a sample of 81 houses was selected and the electric usage was determined. Assume a population standard deviation of 450 kilowatt-hours. If the sample mean is 1858 kWh, the 95 confidence interval estimate of the population mean is
 a. 1760 to 1956 kWh.
  b. 1729 to 1987 kWh.
  c. 1758 to 1958 kWh.
  d. 1776 to 1940 kWh.
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syaarsyaar
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Theleeman Author
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6 years ago
this is exactly what I needed
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This site is awesome
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Brilliant ツ
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