7. Consider each situation described. Identify the population and the sample, explain what p and represent, and tell whether the methods of this chapter can be used to create a confidence interval.

a) A consumer group hoping to assess customer experiences with auto dealers surveys 167 people who recently bought new cars; 3% of them expressed dissatisfaction with the salesperson.

b) A cell phone service provider wants to know what percent of U.S. college students have cell phones. A total of 2883 students were asked as they entered a football stadium, and 2243 indicated they had phones with them.