Casio fx-7400G PLUS Booklet
Also see for fx-7400G PLUS: User guideProduct catalogueSpecificationsSpecificationsPrograming manual
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– 60 –Q-2 Component Quality Variation Control(X-R Control Chart)The X-R control chart is widely used to control variations in dimensions, quality, strength,and other qualities. X is the mean value and R is the range, which is the differencebetween the maximum and minimum values of a group of data. This data expressesvariance instead of standard deviation.The data sheet below was created by selecting five items from each of 25 lots. Thediameter of each item was measured and recorded in the data sheet, which was then usedto create the X-R control chart.X-R Control Chart Data Sheet (Example)GroupNumberMeasured Values [mm] Total Mean RangeTotalJIKKYO SHUPPAN CO., LTD.: SHIN KIKAI KOSAKU 2 |
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