Quality Digest, March 5, 2018


Figure 1:  The 100 Wire Length Data



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Figure 1:  The 100 Wire Length Data

  Figure 2 shows 200 data from bead board number 7.  These values have an average of 12.86

and a standard deviation statistic of 3.46.  The three intervals of the empirical rule contain,

respectively, 66 percent, 97 percent, and 100 percent of the data.

1

2

3



4

5

6



7

8

9



10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

12.86


3.46

3.46


3.46

3.46


3.46

3.46


66%

97%


100%

2.48


23.24

Figure 2:  200 Data from Bead Board No. 7

Figure 3 shows 259 batch weight data.  These values have an average of 937.0 kg and a

standard deviation statistic of 61.3 kg.  The three intervals of the empirical rule contain,

respectively, 70.3 percent, 94.6 percent, and 98.8 percent of the data.




Donald J. Wheeler

The Empirical Rule

www.spcpress.com/pdf/DJW328.pdf

3

March 2018



750

800


850

900


950

1000


1050

1100


1150

937


61.3

61.3


61.3

61.3


61.3

61.3


70.3%

94.6%


98.8%

753


1121


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