A random sample of 64 bicycle-riding adults in Portland indicated that 24 always wore a helmet while
Question:
a. Use the sample information to develop a 95% confidence interval estimate for the difference between the proportions of bicycle-riding adults that wear a helmet in the two cities.
b. Based on the sample results, can you conclude that the population proportion of bicycle-riding adults in Portland who always wear a helmet is greater that the population proportion of bicycle-riding adults in Amsterdam who always wear a helmet? Use a 0.025 level of significance to conduct the test.
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n P 64 n A 80 2464 0375 1880 0225 a 005 2 025 z 196 0375 0225 196 15 14...View the full answer
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Related Book For 
Business Statistics A Decision Making Approach
ISBN: 9780133021844
9th Edition
Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry
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