A study was conducted to determine whether big-city and small-town dwellers differed in their helpfulness to strangers. In this study, the investigators rang the doorbells of strangers living in New York City or small towns in the vicinity. They explained they had misplaced the address of a friend living in the neighborhood and asked to use the phone. The following data show the number of individuals who admitted or did not admit the strangers (the investigators) into their homes: Helpfulness to Strangers Admitted strangers into their home Did not admit strangers into their home Big-city dweller 60 90 150 Small-town dweller 70 30 100 130 120 250 Do big-city dwellers differ in their helpfulness to strangers? Use _ _ 0.05 in making your decision.