Recently, the number of airline companies that offer in-flight Wi-Fi service to passengers has increased. However, it is estimated that only 10% of the passengers who have Wi-Fi available to them are willing to pay for it. Suppose Gogo, the largest provider of airline Wi-Fi service, would like to test this hypothesis. By randomly sampling 125 passengers and asked them if they would be willing to pay $4.95 for 90 minutes of onboard Internet access. Suppose that 20 passengers indicated they would use the service.

a. State the appropriate null and alternative hypotheses.

b. Based on the sample data, test the null hypothesis using an ? = .05. Discuss the results of the test.