### Home > INT3 > Chapter 7 > Lesson 7.1.4 > Problem 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 0.10 defective, and the LCL is 0.05 defective. Homework Help ✎

Create a process control chart for the following hours.

Hour

1

2

3

4

5

6

7

8

9

10

11

12

13

proportion

defective0.06

0.08

0.09

0.06

0.05

0.08

0.08

0.07

0.11

0.10

0.05

0.07

0.04

Hour

14

15

16

17

18

19

20

21

22

23

24

25

proportion

defective0.08

0.08

0.09

0.08

0.09

0.09

0.08

0.09

0.10

0.06

0.05

0.05

*checksum 1.88*As a quality control engineer for Bright Idea, what do you report about the process control?

Place the 'hours' on the *x*-axis and the 'proportion defective' on the *y*-axis. Scale the *y*-axis from 0.05 to 0.10.

Draw a centerline at *y* = 0.075 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?