MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Transcribed Image Text:The U.S. Energy Information Administration claimed that U.S. residential customers used an average of
10,941 kilowatt hours (kWh) of electricity this year. A local power company believes that residents in their
area use more electricity on average than EIA's reported average. To test their claim, the company
chooses a random sample of 115 of their customers and calculates that these customers used an
average of 11,425 kWh of electricity last year. Assuming that the population standard deviation is
3217 kWh, is there sufficient evidence to support the power company's claim at the 0.02 level of
significance?
Step 2 of 3: Compute the value of the test statistic. Round your answer to two decimal places.
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