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A manufacturer has excessive defects relative to a set of symmetric specifications. The process mean is...

  1. A manufacturer has excessive defects relative to a set of symmetric specifications. The process mean is on target so the only way to reduce defects is to reduce process variation. Historically the process standard deviation was 0.05 inches. After changes were made to the process 50 samples were made having a sample standard deviation of 0.03 inches.

    1. By hand perform a hypothesis test (using α=0.05 and the 7-step approach shown in class including finding the bounds on the p-value) to assess if the variation has been reduced.

    2. Verify these results using Minitab.

Math   Statistics-And-Probability   
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