Fundamentals of Statistics (5th Edition)
Fundamentals of Statistics (5th Edition)
5th Edition
ISBN: 9780134508306
Author: Michael Sullivan III
Publisher: PEARSON
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Chapter B.4, Problem 3AYU

NW 3. Hazardous Activities In a survey of 3029 adult Americans, the Harris Poll asked people whether they smoked cigarettes and whether they always wear a seat belt in a car. The table shows the results of the survey. For each activity, we define a success as finding an individual who participates in the hazardous activity.

  No Seat Belt (success) Seat Belt (failure)
Smoke (success) 67 448
Do not smoke (failure) 327 2187
  1. (a) Why is this a dependent sample?
  2. (b) Is there a significant difference in the proportion of individuals who smoke and the proportion of individuals who do not wear a seat belt? In other words, is there a significant difference between the proportion of individuals who engage in hazardous activities? Use the α = 0.05 level of significance.
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