A recent study examined “sidewalk rage” in an attempt to find insight into anger’s origins and offer suggestions for anger-management treatments (The Wall Street Journal, February 15, 2011). “Sidewalk ragers” tend to believe that pedestrians should behave in a certain way. One possible strategy for sidewalk ragers is to avoid walkers who are distracted by other activities such as smoking and tourism.

Sample data were obtained from 50 pedestrians in Lower Manhattan. It was noted if the pedestrian was smoking (equaled 1 if smoking, 0 otherwise) or was a tourist (equaled 1 if tourist, 0 otherwise). The accompanying table shows a portion of the data; the complete data set, labeled Pedestrians, can be found on the text website.

SmokingTourist

0.........1

0.........1

: ......... :

0.........0

a. Construct and interpret the 95% confidence interval for the proportion of pedestrians in Lower Manhattan who smoke while walking.

b. Construct and interpret the 95% confidence interval for the proportion of pedestrians in Lower Manhattan who are tourists.