Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage Page: 47
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alternate hypothesis accepted. The objective criteria for the null hypotheses for research
questions 1, 2, and 3 are provided in equations 15, 16, and 17 (Diamond 1989),
X PlasmaBond - X untreated * = t SAve - +- (15)
Sgreased -X ungreased = sAve -- 1(16)
X+AB - X-AB*=t SAve 1+- 1 (17)
The 16 x 16 Hadamard matrix with a sample size of 8 resulted in a replicated
complete factorial design because each combination of the two factors was tested more
than once (Diamond 1989). The actual test sequence was determined by drawing the trial
number out of a hat. This randomized the sequence of the trials to minimize the effect of
intervening variables and any unidentified extraneous variables. Table 2 shows the test
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Taylor, John Abner. Effects of a Surface Engineered Metallic Coating on Elastomeric Valve Stem Seal Leakage, thesis, December 2000; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc2690/m1/55/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .