Question: Using an injection molding process, a plastics company produces interchangeable cell phone covers. After molding, the covers are sent through an intricate painting process. Quality

Using an injection molding process, a plastics company produces interchangeable cell phone covers. After molding, the covers are sent through an intricate painting process. Quality control engineers inspect the covers and record the paint blemishes. The number of blemishes found in 24 samples of 5 covers are as follows: 2, 1, 5, 5, 3, 3, 1, 3, 4, 5, 4, 4, 1, 5, 2, 2, 3, 1, 4, 4, 2, 1, 5, 3

a) Find the center line and control limits for the c chart for this process. Are there any points outside the control limits?

b) Find the center line and control limits of the control chart for average number of nonconformities per unit/cover (u chart) for this process. Are there any points outside the control limits?

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