Essay
In the manufacture of vitamin capsules, the proportion of calcium in each capsule has a specification of parts per million (ppm). A random sample of 100 capsules revealed a sample average calcium content of 44.5 ppm and a sample standard deviation of 3.2 ppm. Management uses
and R-charts to monitor the calcium amount using samples of size 4. The charts depict an in-control process.
The centerline of the R chart is 6.7 and the centerline of the chart is 44.8.
a Compute for this process using estimates of the process mean and standard
deviation derived from the random sample.
b. Compute for this process using estimates of the process mean and standard
deviation derived from the control chart parameters.
c. Compute for this process using estimates of the process mean and standard
deviation derived from the random sample.
. Compute for this process using estimates of the process mean and standard
deviation derived from the control chart parameters
d. What do the differences between the values of and
tell you?
Correct Answer:

Verified
a. 
b. 
c.
and 
Therefore,
.
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Correct Answer:
Verified
b.
c.
Therefore,
...
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