Two suppliers manufacture a plastic gear used in a laser printer the impact strength of these gears measured in foot-pounds is an important characteristics . Random sample of 100 gears from supplier 1 result in average 290and standered deviation 12, while another random sample of 81 gears from the second supplier results in average 321 and standered deviation 22 is there evidence to support the clain that supplier 2 provides gears with higher mean impact strength ? use alpha 0.05