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7-47.

At the Bright Idea Lighting Company ten flashlights are sampled each hour to determine whether the manufacturing process is in control. The UCL is defective, and the LCL is defective.

  1. Create a process control chart for the following hours.

    Hour

    proportion
    defective

    Hour

    proportion
    defective

    checksum

    Place the 'hours' on the x-axis and the 'proportion defective' on the -axis. Scale the -axis from to .

  2. As a quality control engineer for Bright Idea, what do you report about the process control?

    Draw a centerline at on your graph.
    Comment on how close/far the points are relative to the centerline.
    What about several points in a row staying above/below the centerline?