f98Key2c - Answer Key for Exam II Version C 1. Since we are...

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Answer Key for Exam II Version C 1. Since we are comparing more than two groups, we use ANOVA table. Ho : The mean time to deliver orders is the same for all three suppliers. Ha : The mean time to deliver orders is not the same for all three suppliers. Ans. B ANOVA Source of Variation SS df MS F P-value F crit Between Groups 132.84 2 66.42 6.34 0.0043 3.22 Within Groups 440.27 42 10.48 Total 573.11 44 2. To calculate the test statistic for the claim there is a difference in the mean times to special- order a part from a supplier, F* = MS(Between) / MS(Within) = 66.42 / 10.48 = 6.34. Ans. D 3. From the F-tables (v 1 = 2, v 2 = 42) using α = .05 , the critical value is 3.23. Ans. C 4. Since p-value (=0.0043) < α (=.05) , the decision is to reject Ho. Ans. E ANOVA Table SOURCE df SS MS F P-value FACTOR 3 60.9 20.3 13.53 0.0001 BLOCK 6 225.12 37.52 25.01 0.0001 ERROR 18 27.0 1.5 TOTAL 27 5. Since number of factor levels - 1 = df for factor, 3(df for Factor) + 1 = 4(number of factor levels). The factor was at 4 levels.
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This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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f98Key2c - Answer Key for Exam II Version C 1. Since we are...

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