Air voids in Exercise 13-13. Use α = 0.05. (a) Apply Fishers LSD method with α =
Question:
(a) Apply Fisher€™s LSD method with α = 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.
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Significant differences between levels 1 and 2 and ...View the full answer
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Related Book For 
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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