Subgrop size, n

d₂

d₃

2

1.28

0.8525

3

1.693

0.8884

4

2.059

0.8798

5

2.326

0.8641

6

2.534

0.848

7

2.704

0.8332

8

2.847

0.8198

9

2.97

0.8078

10

3.078

0.7971

11

3.173

0.7873

12

3.258

0.7785

13

3.336

0.7704

14

3.407

0.763

15

3.472

0.7562

20

3.735

0.7287

25

3.931

0.7084

30

4.086

0.6927

40

4.322

0.6692

50

4.498

0.6521

100

5.015

0.6052