Sigma upper and lower control limits for the x-bar chart

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Reference no: EM131139567

Nancy, Inc. manufactures 4 ounce chocolate bars. Random samples of size four were taken and weighed. Eight hours of observation provided the following data.

Sample Mean Range

1 4.01 0.14

2 4.03 0.18

3 3.98 0.16

4 4.20 0.17

5 3.89 0.13

6 4.00 0.18

7 4.05 0.17

8 4.03 0.16

9 4.08 0.15

a. Determine the 3 sigma upper and lower control limits for the x-bar chart.

b. Determine the 3 sigma upper and lower control limits for the R-chart.

Reference no: EM131139567

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Sigma upper and lower control limits for the x-bar chart : Nancy, Inc. manufactures 4 ounce chocolate bars. Random samples of size four were taken and weighed. Eight hours of observation provided the following data. Determine the 3 sigma upper and lower control limits for the x-bar chart. b. Determine the 3 ..

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