The airline company in Exercise 4 has realized that some of its customers either don’t have email or don’t check it regularly. It decides to restrict the mailing to customers who have recently registered for a “Win a Trip to Miami” contest, figuring that those with internet access are more likely to read and respond to its email. The company sends an email to recent registrants with the following message:

“Did you know that National Airlines has just spent over \($3\) million refurbishing our brand-new hub in Miami? By answering the following question, you may be eligible to win \($1000\) worth of coupons that can be spent in any of the fabulous restaurants or shops in the Miami airport.

Might you possibly think of travelling to Miami in the next six months on your way to one of your destinations?”

a) What is the population?

b) What is the sampling frame?

c) Point out any problems you see with the sampling procedure and/or the survey itself. What are the potential impacts of these problems?

Data from in exercise 4 

An airline company is interested in the opinions of its frequent flyer customers about its proposed new routes. Specifically, pollsters want to know what proportion of flyers plan to use one of the airline’s new hubs in the next six months. The pollsters take a random sample of 10,000 from the database of all frequent flyers and send them an email message with a request to fill out a survey in exchange for 1500 air miles.

a) What is the population?

b) What is the sampling frame?

c) What is the population parameter of interest?

d) What sampling method is used?