HW - Chapter 15

# HW - Chapter 15 - 2102 Section 001 HW#4 Problem#15.12a Step...

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2102 – Section 001 HW #4 Problem #15.12a Step 1: H o : u 1 = u 2 = u 3 = u 4 = u 5 Type of lacquer used has no statistically significant effect on the number of days until the first sign of corrosion was observed. H a : Not H o Type of lacquer used does have a statistically significant effect on the number of days until the first sign of corrosion was observed. Step 2: Decision Rule – Use Alpha = .05 (Always a Right-Tailed Test; Rejection Region is always in the Right Tail) Reject the Null Hypothesis if Pvalue is less than alpha (.05). Reject the Null Hypothesis if Ftest is greater than Falpha. (2.4472) Step 3: Compute ANOVA (Alpha=0.05; yes, even though book says 0.01) Alpha=.05 Source of Variation SS df MS Ftest P-value F crit Between Groups 17250.5 4 4312.63 3.31866 0.01287 2.44723651 Within Groups 155941 120 1299.51 Total 173192 124 SUMMARY Groups Count Sum Average Variance Lacquer 1 25 4114 164.56 1164.42 Lacquer 2 25 4641 185.64 1719.91 Lacquer 3 25 3869 154.76 1113.61 Lacquer 4

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HW - Chapter 15 - 2102 Section 001 HW#4 Problem#15.12a Step...

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