Health officials are concerned about the number of people who get the influenza vaccine. So they are constantly trying to find ways to encourage people to get the vaccine. The minister of health wants to see if educating the public about the importance of being vaccinated will increase the number of recipients next year.

For each scenario below (a to c), answer the following questions:

1. Determine whether it is an observational study, experiment, or survey. Explain.
2. Identify the "Who" (individuals being measured). Hint: "Who" is not always a person.
3. Identify the "What" (variable(s)). Note: in an experiment, you should identify both the response variable and explanatory variable.

Scenario (a). A member of the Ministers staff looks at the past records, which show that 35% of Nova Scotians got the flu shot last year.

Scenario (b). Another member interviews a random sample of 100 people in Nova Scotia, and finds that 39% of them had a flu shot last year.

Scenario (c). A public health nurse wants to see if educating the public will improve the results. She selects 100 Nova Scotians, and randomly gives 50 of them a flyer about the importance of getting the flu shot. The other 50 attend a talk that she gives about the benefits to immunization. Later in flu season, the proportion of people who got the flu shot will be recorded for each group.