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388 APPENDICES

Appendix 2Critical 5% values for Cochran’s test for homogeneity of variance. C=(largest s^2 )/(∑s^2 j).

k=number of variances

d.f. for s^2 j 23456789101520

1 0.9985 0.9669 0.9065 0.8412 0.7808 0.7271 0.6798 0.6385 0.6020 0.4709 0.3894

2 0.9750 0.8709 0.7679 0.6838 0.6161 0.5612 0.5157 0.4775 0.4450 0.3346 0.2705

3 0.9392 0.7977 0.6841 0.5981 0.5321 0.4800 0.4377 0.4027 0.3733 0.2758 0.2205

4 0.9057 0.7457 0.6287 0.5441 0.4803 0.4307 0.3910 0.3584 0.3311 0.2419 0.1921

5 0.8772 0.7071 0.5895 0.5065 0.4447 0.3974 0.3595 0.3286 0.3029 0.2195 0.1735

6 0.8534 0.6771 0.5598 0.4783 0.4184 0.3726 0.3362 0.3067 0.2823 0.2034 0.1602

7 0.8332 0.6530 0.5365 0.4564 0.3980 0.3535 0.3185 0.2901 0.2666 0.1911 0.1501

8 0.8159 0.6333 0.5175 0.4387 0.3817 0.3384 0.3043 0.2768 0.2541 0.1815 0.1422

9 0.8010 0.6167 0.5017 0.4241 0.3682 0.3259 0.2926 0.2659 0.2439 0.1736 0.1357

10 0.7880 0.6025 0.4884 0.4118 0.3568 0.3154 0.2829 0.2568 0.2353 0.1671 0.1303

WECD01 08/17/2005 04:54PM Page 388