# I need the correct answer for ch. 7

Jul 28th, 2015
Anonymous
Category:
Mathematics
Price: \$5 USD

Question description

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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