Nancy, Inc. manufactures 4 ounce chocolate bars. Random samples of size four were taken and weighed. Nine 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 upper and lower control limits for the X-bar chart.
b. Determine the upper and lower a/b zone boundary for the X-bar chart.
d. Determine the upper and lower a/b zone boundary for the R-chart.
Nancy, Inc. manufactures 4 ounce chocolate bars. Random samples of size four were taken and weighed....