Statistics

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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 -

    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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