Question 6

Alamo Rent-A-Car executives believe that Alamo accounts for about 50% of all Cadillacs that are rented. To test this belief, a researcher randomly identifies 20 major airports with on-site rental car lots. Observers are sent to each location and instructed to record the number of rental-company Cadillacs observed in a four-hour period. About 500 are observed, and 30% are observed being returned to Alamo Rent-A-Car.

a) What is the null hypothesis?

b) Perform a hypothesis test for percentages and calculate the z value.

c) Is the executives' belief supported by the data? p 0 words Flag question:

Question 7

A survey was conducted for a pet supply specialty retailer called Pets, Pets, & Pets (PPP). 180 dog owners and 153 cat owners participated in the survey. They were asked whether they would recommend PPP to a friend. 91% dog owners answered yes while among the cat owners, the number is 75%. Perform a differences test (95% level of confidence) to determine whether dog owners differ from cat owners with respect to their answer to this question.