Posted by **Johnny** on Friday, January 30, 2009 at 9:36pm.

Construct the appropriate control chart for the observations listed below, using 3 sigma limits.

Product Number - Number of defects

1 - 3

2 - 3

3 - 6

4 - 5

5 - 3

6 - 5

7 - 2

8 - 2

9 - 3

10 - 4

11 - 6

a. Determine the upper and lower control limits.

b. Discuss the chart you have plotted. What conclusions and recommendations do you make from the chart and the data?

- Statistics -
**MathGuru**, Sunday, February 1, 2009 at 10:38am
Here's what you will need to answer this question:

Lower limits = mean - 3(sd/√n)

Upper limits = mean + 3(sd/√n)

sd = standard deviation

n = sample size

You will need to calculate the mean and standard deviation from the data given. Once you have those values, you can then determine the lower and upper limits.

I hope this will help get you started.

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