It is given that :
Sample size = n = 10 Eagletrons
Average Range = Rbar = 4 miles/ hour
Following are the values of Constants as derived from standard table for X bar and Rbar chart :
D3 = 0.223
D4 = 1.777
Therefore ,
Upper Control Limit for R chart = D4 x Rbar = 1.777 x 4 = 7.108 miles / hour
Lower Control Limit for R chart = D3 x Rbar = 0.223 x 4 = 0.892 miles/ hour
X bar chart is used when there is a set of fixed number of observations against each sample and there are number of samples.
C Chart is used when number of defects in each item for a set of items are provided and one is required to establish control limits for number of defects in items ( note: Control limits are to be established for “number of defects in an item” and not “number of defective items in a sample”)
P chart is used when number of defectives against each sample are presented and one needs to find out control limits for number of defectives / proportion of defectives in each sample ( note: p chart is used to establish control limits for number / proportion of defectives in a sample and not number of defects in an item)
Presented here is “Number of defectives” against 10samples. Therefore appropriate control chart will be p chart
THE APPROPRIATE CONTROL CHART THAT IS BEST TO MONITOR THISPROCESS IS p CHART
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