6. A consumer group hoping to assess customer experiences with auto dealer surveys 160 people who recently bought new cars; 7% of them expressed dissatisfaction with the salesperson. We want to learn about the general opinion towards the salesperson. a. What is the meaning of population proportion p in context? What is the meaning of sample proportion p in context? b. Is it appropriate to use a traditional (Wald) condence interval for the population proportion p? If so. construct a 90% traditional (Wald) condence interval and interpret it in context. If not. please explain why it is not appropriate. c. If we increase the condence level from 90% to 95%, will the width of Cl be increased or decreased? Why