A company's current supplier of casting for a permanent magnet motor has a critical diameter dim measure of an average of 32 millimeters. The company is considering a new supplier and a sample of castings from the new supplier shows the critical dimension average to be 30.5 millimeters. The most appropriate alternative hypothesis for a two-sample hypothesis test for means is

• Mean (old) > Mean (new)
• Mean (old) Mean (new)
• Mean (old) = Mean (new)
• None of these - this is not the answer