A company claims that the mean monthly residential electricity consumption in a certain region is more than 880 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 910 kWh. Assume the population standard deviation is 120 kWh. At =0.10, can you support theclaim?

(b) Find the criticalvalue(s) and identify the rejectionregion(s). Select the correct choice below and fill in the answer box within your choice. Use technology.

(Round to two decimal places asneeded.)

A.

The critical value is

nothing

.

B.

The critical values are

nothing

.