Page 42 - Mechanical Engineers' Handbook (Volume 2)

References 31

O E O–E (O– E) 2 (O– E) /E
2
364 325 39 1520 4.6800
376 396 20 400 1.0100
218 243 25 625 2.5700
89 97 8 64 0.6598
33 30 3 9 0.3000
23 8 15 225 28.1000

2 37.320
exp
Since there is only a 5% chance of obtaining a calculated chi-square statistic as large as
11.07 under the hypothesis chosen, the null hypothesis is rejected and it is inferred that some
real (rather than random) cause exists for the failures with a 95% probability or confidence
level.

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