Question: The number of defective items out of random samples of 100 windshield wipers selected at the end of each production shift at a factory is as follows:
4, 4, 5, 4, 4, 6, 6, 3, 3, 3, 3, 2, 2, 4, 5, 3, 4, 6, 4, 12, 2, 2, 0, 1, 1, 1, 2, 3, 1.
Is there evidence that the production process is out of control?