subject of Btech

3 a) Consider a cropping press on which bars are to be cut continuously to a length of 12cm. A random sample of 5 bars is taken from each hours production and for each sample, the mean and range are calculated as shown in table below. Construct and R charts and examine whether the process is under control and state your recommendations. Sample Range R (size n -5) Mean & 12.004 0.008 12.002 0.007 11,992 0.010 11.993 0.004 12.000 0.005 12.003 0.015 11.996 0.012 12.003 0.007 12.003 0.009 12.000 0.010 11.998 0.005 11.996 0.014 12.001 0.010 12.000 0.011