Question: Cross-linker Exercise 13-14. Use Î± = 0.05. (a) Apply Fishers LSD method with Î± = 0.05 and determine which levels of the factor differ. (b)

Cross-linker Exercise 13-14. Use Î± = 0.05.

(a) Apply Fisher€™s LSD method with Î± = 0.05 and determine which levels of the factor differ.

(b) Use the graphical method to compare means described in this section and compare your conclusions to those from Fisher€™s LSD method.

Exercise 13-14

An article in Quality Engineering [€œEstimating Sources of Variation: A Case Study from Polyurethane Product Research€ (1999€“2000, Vol. 12, pp. 89€“96)] reported a study on the effects of additives on final polymer properties. In this case, polyurethane additives were referred to as cross-linkers. The average domain spacing was the measurement of the polymer property. The data are as follows:

Cross- Linker Level Domain Spacing (nm) -1 8.2 8. 8.2 7.9 8.1 8.3 8.4 8.3 8.2 8.3 8.1 -0.75 8.9 8.7 8.9 8.4 8.3 8.5 -0.5

Cross- Linker Level Domain Spacing (nm) -1 8.2 8. 8.2 7.9 8.1 8.3 8.4 8.3 8.2 8.3 8.1 -0.75 8.9 8.7 8.9 8.4 8.3 8.5 -0.5 8.5 8.7 8.7 8.7 8.8 8.8 0.5 8.8 9.1 9.0 8.7 8.9 8.5 8.6 8.5 8.6 8.7 8.8 8.8

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