In a survey of 3029 adult Americans, the Harris Poll asked people whether they smoked cigarettes and

Question:

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 deï¬ne a success as ï¬nding an individual who participates in the hazardous activity.

(a) Why is this a dependent sample?
(b) Is there a signiï¬cant 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 signiï¬cant difference between the proportion of individuals who engage in hazardous activities? Use the Î± = 0.05 level of signiï¬cance.