I need the correct answer for ch. 7

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I need the correct answer for ch. 7

Problem #38 Electricity Consumption:

The U.S. Energy Information Association claims that the mean monthly residential electricity consumption in your town is more than 874 kilowatt-hours (kWh). You want to test this claim. You find that a random sample of 64 residential customers has a mean monthly electricity consumption of 905 kWh. Assume the population standard deviation is 125 kWh. At α = 0.05, do you have enough evidence to support the association’s claim? (Adapted from U.S. Energy Information Association)

  • Identify the claim and state Ho and Ha
  • Find the critical value(s) and identify the rejection region(s)
  • Find the standardized test statistic z
  • Decide whether to reject or fail to reject the null hypothesis, and
  • Interpret the decision in the context of the original claim.

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