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Week 3 Exercises

# Week 3 Exercises - Week 3 exercises 1 Week 3 Exercises...

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Week 3 exercises 1 Week 3 Exercises Justin Grunigen RES342 Mark Talbot University of Phoenix – North Florida Thursday August 19, 2010

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Week 3 exercises 2 Week 3 Exercises 1. Chapter Exercises 10.30 a. H 0 : p 1 = p 2 H a : p 1 > p 2 b. Reject H 0 if z > 2.326 c. Z= 2.961 d. Since the test statistic is in the rejection region, we reject the null hypothesis. We have sufficient evidence to conclude that the yellow fire trucks significantly reduced the accident rate. e. p-value = 0.0015. Since the p-value is less than 0.01 we reject the null hypothesis. f. The difference is large enough at 1% level of significance. It's large for this sample. g. Normality might not be fulfilled because 4 is a very small (<5) number in the second group. 2. Chapter Exercises 10.44 a. H 0 : p 1 = p 2
Week 3 exercises 3 H a : p 1 < p 2 b. Z=-3.984 p-value = 0.000 (almost zero) c. Sample sizes are large and normality is assured. d. The difference is large enough at an alpha value of 0.01. e. Before prescribing the drug widely the researchers should know if the sampling was done randomly. After that they need to check the side effects of the drug.

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