### Home > INT3 > Chapter 7 > Lesson 7.1.4 > Problem 7-47

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

Create a process control chart for the following hours.

Hour

proportion

defectiveHour

proportion

defective*checksum*Place the 'hours' on the

*x*-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?