Assume that items produced are supposed to be normally
Chapter , Problem 1(choose chapter or problem)
Assume that items produced are supposed to be normally distributed with mean 35 and standard deviation 3. To monitor this process, subgroups of size 5 are sampled. If the following represents the averages of the first 20 subgroups, does it appear that the process was in control? Subgroup No. X Subgroup No. X 1 34.0 6 32.2 2 31.6 7 33.0 3 30.8 8 32.6 4 33.0 9 33.8 5 35.0 10 35.8 (continued)
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