A company clalms that the mean monthly residential electricity consumption in a certain region is more than 870 kiloWatt-hours (kWh). You want to test this claim You find that a random sample of 63 residential customers has a mean monthly consumption of 890 kWh. Assume the population standard deviation is 127 kWh. The level of significance a is equal to 0.05. Select the corect option below. ... O A. Fail to reject Ho because the standardized test statistic is in the rejection region. O B. Reject Ho because the standardized test statistic is in the rejection region. O C. Reject H, because the standardized test statistic is not in the rejection region. O D. Fail to reject Ho because the standardized test statistc is not in the rejection region.

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