Question: Air voids in Exercise 13-13. Use Î± = 0.05. (a) Apply Fishers LSD method with Î± = 0.05 and determine which levels of the factor

Air voids in Exercise 13-13. 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 13-13

A paper in the Journal of the Association of Asphalt Paving Technologists (1990, Vol. 59) described an experiment to determine the effect of air voids on percentage retained strength of asphalt. For purposes of the experiment, air voids are controlled at three levels; low (2€“4%), medium (4€“6%), and high (6€“8%). The data are shown in the following table.

Air Voids Retained Strength (%) 88 90 79 83 91 70 103 92 95 83 87 69 85 Low 106 90 69 80 78 Medium 94 High 62 69 76 85 8

Air Voids Retained Strength (%) 88 90 79 83 91 70 103 92 95 83 87 69 85 Low 106 90 69 80 78 Medium 94 High 62 69 76 85 80

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