Henderson Corporation makes metal sheets, among other products. When the process that is used to make metal

Question:

Henderson makes metal sheets, among other products. When the process that is used to make metal sheets works properly, 92% of the metal sheets contain no defects, 5% have one defect each, and 3% have two or more defects each. The quality control inspectors at the company take samples of metal sheets quite often and check them for defects. If the of defects for a sample is significantly different from the above-mentioned percentage the process is stopped and adjusted. A recent sample of 300 sheets produced the frequency of defects listed in the following table.

Does the evidence from this sample suggest that the process needs an adjustment? Use Î± = .01.

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