General Hydraulics, Inc. is a manufacturer of hydraulic machine tools. It has ha
ID: 1179670 • Letter: G
Question
General Hydraulics, Inc. is a manufacturer of hydraulic machine tools. It has had a history of leakage trouble resulting from a certain critical fitting. Twenty-five samples of machined parts were selected; one per shift, and the diameter of the fitting was measured. a. Construct x-bar and R charts for the data listed in the EXCEL worksheet Problem 1
b. If the regular machine operator was absent when samples 4, 8, 14, and 22 were taken, how will the results in part (a) be affected?
c. A second table in the worksheet represents measurements taken during the next 10 shifts. What information does this table provide to the quality control manager?
Explanation / Answer
The X-bar Chart and R-Chart plotted as per the part a.) of the problem., Here, when the sample
averages are plottes on this chart, no indication of out-of-control condition is osberved.
Therefore, since both X-Bar and R-Chart exhibits control, Quality manager coclude that tha process is in
control at the stated leves.
While in the case where regular machine operator was absent when samples 4, 8, 14, and 22 were taken
the graph of X-Bar , it shows no indication of out of control situation , whereas in the R-Chart, the sample variability
is not in control as the 18th sample, all has crossed the UCL level.,is has more variability
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