The Grey Chronicles

2008.September.22

Appendix F: Anderson-Darlington Normality Test


Using Minitab 14, the Anderson-Darlington Test for NSC flat carbon steel production, particularly cold-rolled coils, does not follow normal distribution.


Minitab 14)

Figure 38: Statistical Summary for NSC CRC Production, 1995-1999 (Data: NSC; Source: Minitab 14)

The Minitab-computed p-value is 0.024 is less than the predetermined significance level of 0.05. The kurtosis statistic implies that the distribution is flatter than normal. The box-plot indicates that the data is skewed. There are no indications of outliers.

Using Minitab 14, the Anderson-Darlington Test for NSC flat carbon steel production, particularly hot-rolled coils, also does not follow normal distribution.


Minitab 14)

Figure 39: Statistical Summary for NSC HRC Production, 1995-1999 (Data: NSC; Source: Minitab 14)

The Minitab-computed p-value is 0.013 is less than the predetermined significance level of 0.05. The kurtosis statistic implies that the distribution is flatter than normal. The box-plot indicates that the data is skewed. There are no indications of outliers.

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