As the manager of a factory, Terry is concerned about recent customer complaints. He collected the data below in order to conduct a 3-sigma control chart analysis.

Sample Number of Defects Sample Size

1 6 20

2 4 20

3 7 20

4 5 20

5 9 20

6 3 20

7 5 20

8 8 20

9 9 20

10 10 20

Terry hired you to build a p-chart to analyze this business process.

What is the center line or p-bar for this chart?

Group of answer choices

0.41

0.75

0.57

0.33

What is the standard deviation of the proportion of defects (sigma-p)?

Group of answer choices

0.105

0.251

0.169

0.281

What is the upper control limit?

Group of answer choices

0.267

0.451

0.557

0.645

What is the lower control limit?

Group of answer choices

0

-0.032

0.015

0.032

Which of the following statements is true about this process?

Group of answer choices

The process is out of control

The process is in control

Cannot determine based on the data