1.71 Harris Interactive conducted an online poll of U.S. adults during December 2004 for the Wall Street Journal Online’s Health Industry Edition.

a. What is the population?

b. Name at least four variables that must have been used.

c. Classify all the variables of the study as either attribute or numerical.

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These are some of the results of a Harris Inter- active poll of 2,013 U.S. adults conducted online between December 14 and 16, 2004 for the Wall Street Journal Online's Health Industry Edition. Of all adults who have received a flu vaccine this year, 43 percent received it in a doctor's office. Other places adults have received a flu shot this year include vaccination clinics (18%), workplaces or schools (12%), and pharmacies (10%). Of note, nobody reported purchasing a flu vaccine via the Internet or in Canada. Of the 83 percent of adults who have not had a flu shot this year, the majority (77%) say they are taking precautions to reduce their risk of catching the flu this season. The most common precaution reported being taken is to wash hands, wear gloves or use hand cleaning products more frequently (63%). Other precautions include taking vitamins or supplements (49%), trying to follow a healthy diet (42%), getting more rest (34%), and avoiding crowded places (24%).