A company claims 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

69

residential customers has a mean monthly consumption of

890

kWh. Assume the population standard deviation is

125

kWh. At

=0.10,

can you support the claim? Complete parts (a) through (e)