Intro Stats
4th Edition
ISBN: 9780321825278
Author: Richard D. De Veaux, Paul F. Velleman, David E. Bock
Publisher: PEARSON
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Chapter R, Problem 5.26RE
Safety Observers in Texas watched children at play in eight communities. Of the 814 children seen biking, roller skating, or skateboarding, only 14% wore a helmet.
- a) Create and interpret an appropriate 95% confidence interval.
- b) What concerns do you have about this study that might make your confidence interval unreliable?
- c) Suppose we want to do this study again, picking various communities and locations at random, and hope to end up with a 98% confidence interval having a margin of error of ±4%. How many children must we observe?
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Chapter R Solutions
Intro Stats
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