A company claims that the mean monthly residential

Last updated: 7/23/2022

A company claims that the mean monthly residential electricity consumption in a certain region is more than 860 kilowatt-hours (kWh). You want to test this claim. You find that a random sample of 60 residential customers has a mean monthly consumption of 900 kWh. Assume the population standard deviation is 129 kWh. At α = 0.01, can you support the claim? Complete parts (a) through (e) (d) Decide whether to reject or fail to reject the null hypothesis. A. Fail to reject Ho because the standardized test statistic is in the rejection region. B. Reject Ho because the standardized test statistic is not in the rejection region. C. Fail to reject Ho because the standardized test statistic is not in the rejection region. D. Reject Ho because the standardized test statistic is in the rejection region. (e) Interpret the decision in the context of the original claim. At the1% significance level, there enough evidence to the claim that the mean monthly residential electricity consumption in a certain kWh.