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170 2:57 Goodness-of-Fit Tests for Normality
level. Note, however, that this combined test is not recommended for samples of size
40 due to its poor power performance; it is given here for purposes of illustration only.

11.7 CONCLUSION

In this chapter, the generic concepts behind GOF tests together with several important
and popular GOF tests have been discussed. Such tests are essential for the appro-
priate statistical modeling of real-world data. This is a critical link in the Six Sigma
approach prior to any process of product optimization exercise which relies on rigor-
ous statistical models.

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