d2 Table

Estimating Process s from Range

d2 Table

 Subgroup Sample Size, n
 d2

2

1.128

3

1.693

4

2.059

5

2.326

6

2.534

7

2.704

8

2.847

9

2.970

10

3.078

11

3.173

12

3.258

13

3.336

14

3.407

15

3.472

16

3.532

17

3.588

18

3.640

19

3.689

20

3.735

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