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Home > CCA2 > Chapter 12 > Lesson 12.2.2 > Problem 12-116

12-116.

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

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

    Hour

    proportion
    defective

    hour

    proportion
    defective

    checksum

    Place the 'hours' on the -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?