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| Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Consider the following summary data on the modulus of elasticity (x 106 psi) for lumber of three different grades [in close agreement with values in the article “Bending trength and Stiffness of Second-Growth Douglas-Fir Dimension Lumber” (Forest Products J., 1991: 35–43), except that the sample sizes there were larger]:

Use this data and a significance level of .01 to test the null hypothesis of no difference in mean modulus of elasticity for the three grades.
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