
Calculate the grand average (xDouble Bar)
37.4+36.4+32.4+46.6+40.8+36.8+37.4+40+37.2+36 divided by 10 = 38.1
Calculate the average range (RBar)
12+14+21+11+22+20+22+17+23+19 divided by 10
= 18.1
NOTE: A2 is a constant that varies based upon sample size and is found in standard statistical tables.
Calculate upper and lower control limits for the averages.
Calculate upper and lower control limits for the ranges.
NOTE: D3 and D4 are constants that varies based upon sample size and is found in standard statistical tables.
Draw Limit Lines!
Draw limits on chart.
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