# HWK 17 - Homework#17 Problems#20 BusinessIssue...

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Homework # 17 Problems  Exercise 20, page 532. Complete Example 2 (of class notes 2-2, page 3). #20 Business Issue The service ratings for different sized ships Business Question Data Frequency Table Small  Medium Large 75 0 0 0 x bar Err:509 Err:509 Min = 75.8 80 1 0 1 stdev Err:509 Err:509 Max = 100 85 0 2 3 s^2 Err:509 ### Dbl x-bar = 88.88 90 0 3 2 8 8 n= 24 95 5 3 2 100 2 0 0 Analysis Hypotheses where s = small, m= medium, and l=large Ha: All the same Test Stat Test statistic is F = MST/MSE from anova.  If Ho is true, this ratio is F distributed with  DF1 = 2 and DF2 = 21 Sig Level Alpha = .05 Reject Rule  Reject Ho if F is >  3.47 Finv ( .05,2,21) Calculations Anova: Single Factor SUMMARY Groups Count Sum Average Variance Small 8 737.6 92.2 40.51 Medium 8 717.2 89.65 24.73 Large 8 678.4 84.8 26.31 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 226.09 2 113.05 3.7 0.04 3.47 Within Groups 640.84

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## This note was uploaded on 03/31/2011 for the course STATS 211 taught by Professor Dunne during the Spring '07 term at University of Dayton.

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HWK 17 - Homework#17 Problems#20 BusinessIssue...

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