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

12-116.

At the Bright Idea Lighting Company

Create a process control chart for the following hours.

Hour

proportion

defectiveHour

proportion

defective*checksum*

Place the 'hours' on the

-axis and the 'proportion defective' on the-axis. Scale the-axis fromto . 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?