Answer to Question 1
a . Personal interview: involves an interviewer soliciting information from a respondent by asking prepared questions; it has a higher expected response rate but is typically expensive.
b. Telephone interview: involves soliciting information by calling people. This is usually less expensive, but it is also less personal and has a lower expected response rate.
c. Self-administered survey: this is an inexpensive method of conducting a survey which is usually mailed to a sample of people; it usually has a very low response rate.
Answer to Question 2
In an observational study, there is no attempt to control factors that might influence the variable of interest. In an experimental study, a factor (such as regular use of fitness center) is controlled by randomly selecting who is exposed to that factor, thereby reducing the influence of other factors on the variable of interest.
Results of Tracing Methods
Older people who exercise cognitive skills, like these chess players, retain those skills well into ...
The social movement that centers on the environment has become global. In all nations, people are ...
Ads from the public service campaign in the late 1960s and early 1970s that encouraged people to get ...
Popular Methods of Conducting Social Science Research
economic question