Mathematics, 04.08.2021 04:40 huntertaleiya
The U. S. Energy Information Administration claimed that U. S. residential customers used an average of 10,76110,761 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 160160 of their customers and calculates that these customers used an average of 11,231kWh11,231kWh of electricity last year. Assuming that the population standard deviation is 2917kWh2917kWh, is there sufficient evidence to support the power company's claim at the 0.010.01 level of significance?
Step 1:
State the null and alternative hypotheses for the test. Fill in the blank below.
H0: μ=10,761
Ha: μ 10,761
<, >, not equal
Step 2: What is the test statistic?
Step 3: Do we fail to reject OR reject the null hypothesis because of sufficient or insufficient evidence?
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