a sample of 900 computer chips revealed that 43% of the chips do not fail in the first 1000 hours of their use. the company's promotional literature states that 40% of the chips do not fail in the first 1000 hours of their use. the quality control manager wants to test the claim that the actual percentage that do not fail is different from the stated percentage. is there enough evidence at the 0.05 level to support the manager's claim?