Question: The manufacturer of steel rods used in the construction of a new nuclear reactor in Shansi Province in China in Spring 2007 looks at random samples of 20 items from each production shift and notes the number of nonconforming rods in these samples. The results of 10 shifts are
8, 7, 8, 9, 6, 7, 8, 6, 6, 8.
Is there evidence that the process is out of control? Explain.