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# Exercises

1.
Northwest Airlines plans to make changes in its frequent-flier Worldperks program. One of them is to discontinue discounts offered for passengers who choose to redeem award miles during off-peak periods. Before doing so, Northwest wants to verify if this policy will discourage customers from flying during off-peak periods. The company made a list of all its flights on one day during an off-peak period, and randomly selected 25 flights. All of the Worldperks members on those flights were then asked whether they would change their travel dates if the discount were discontinued.
(a)
State the target population.
(b)
State the frame and the sampling method used. Is the frame the same as the target population? Do you think this will give a representative sample from the target population? How would you have selected a better sample?
(c)
Construct a short questionnaire that will help Northwest assess the impact of the policy in discouraging customers from flying during off-peak periods.

2.
The patient representative of Bronson Methodist Hospital wanted to make sure that the hospital is providing good service to its patients. He obtained a list of all people that have used the hospital's services for the past year and conducted a phone interview with every 8th person in the list.
(a)
State the target population.
(b)
State the sampling method used. Do you think this will give a representative sample? How would you have selected a better sample?
(c)
Construct a short questionnaire that you think would provide useful information about hospital services.
3.
Wendy's wants to find out whether moving from their current location on West Michigan to Bernhard Center would capture more of the student market. They plan to conduct an opinion survey from 50 students within the premises of the building.
(a)
State the target population.
(b)
How would you select the 50 students? Comment on any possible nonrepresentativeness in your sample. (For example: Would your selection method tend to include too many/few women from among the target population? How about undergraduates? Evening students? Foreign students? Faculty?)
(c)
Construct a short questionnaire that would help Wendy's make a decision.

4.
Western Herald takes an interest in the opinion of WMU students regarding the 2002 ENRON controversy. From each college, 10 students were asked whether campaign contributions was a factor in the Enron failure.
(a)
Describe the target population.
(b)
State the sampling method used. How would you select the 10 students from each college? Do you think this will give a representative sample?
(c)
Construct a short questionnaire for the Herald.

5.
Gartner Research Company wants to compare the consumer satisfaction ratings of AOL (America Online) as an internet service provider(ISP) and an e-mail provider. From a list of online consumers, he randomly chose 6,700 people to participate in the survey.
(a)
Describe the target population.
(b)
State the sampling method used. Do you think this will give a representative sample?
(c)
Construct a short questionnaire for the purpose.

6.
In the year 2002, US News Magazine printed the following survey question:
 Should the government ban human cloning? Yes: 1-900-193-0025 No: 1-900-193-0026 *50 cents per call
Would you consider the results of this opinion poll reliable? Explain.

7.
Radio stations often do audience research in order to estimate the number and type of listeners (for advertising purposes) and discover their preferences (for programming purposes). Design (i) a sampling plan, and (ii) a 10-15 item questionnaire to answer the following questions:

(a)
How large is the audience? (There are two measures here: the "average" size for any point in time, and the "reach" or maximum number of people reached for a period of say, 1 week)
(b)
What are the age, gender, education, and income profile of your audience?

(c)
What type of radio programs interests your audience most and least?

Next: Location and Spread Up: Samples and Populations Previous: A Questionnaire Example

2003-09-08