Receiving quality inspt of abc manufacturing found out from each of last 12 batch of oring id, tom has tested 5;o-ring from each Bach measure and recorded the ff result, with xbar=average ID=mm and R=range of each batch:
Batch 1 2 3 4 5 6 7 8 9 10 11 12
xbar 50.0 50.5 49.0 50.7 50.7 50.6 49.8 51.8 50.2 50.4 50.6 50.7
R=bar 1.8 1.1 1.6 .1 .9 2.1 .3 .8 2.3 1.3 2.0 2.1
xbar=average ID in mm
a. use the above data to contract an x bar chart with control factor chart = d sub of 2 =2.326
b. is the 0-ring id measurement in control? Explain