Business, 22.02.2021 19:40 darlenepitre

Anderset Laboratories produces rough lenses that will ultimately be ground into precision lenses for use in laboratory equipment. The company has developed the following thickness measures, based on 15 samples of four lenses that were taken when the process was under control: MEAN (MICRONS)
(n4) 3.900 4.206 4.214 3.890 4.036 4.134 3.037 5.082 3.404 5.246 4.197 4.312 4.302 3.867 4.170 MINIMUM 3.617 3.971 4.062 3.749 3.501 3.543 2.935 3.797 2.837 5.106 4.085 3.949 3.989 3.617 4.046
MAXIMUM 3.989 4.302 4.400 3.937 4.084 4.584 3.929 5.695 4.255 6.382 4.239 4.356 4.400 3.900 4.206
a) Use these data to calculate X and R and set up the
b) Can the process be "under control" in statistical
c) Suppose Anderset laboratories takes some appropriate control charts. terms but still fail to meet the needs of AnderSet's cus- tomers?
Explain, using a numerical example. additional samples of the same size, yielding the following results. Plot these samples on the control charts and circle any observations that appear to be out of control

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