solved Researchers try to use a sample of the population that

Researchers try to use a sample of the population that is truly representative of the people in whom they are interested—one of the main reasons for using random selection. Even so, the sample is usually selected from within a particular segment of the social world in which the researchers themselves live and work.
For example, in the United States there are some fairly distinct differences between people from the Northeast and people from the Southeast, and the same can be true in many other countries. There are also differences between large city populations and populations living in the countryside.
If a psychologist is conducting a study in a particular geographical area of a country, how might regional differences impact the study’s results? What measures could or should the psychologist take to minimize the impact?

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Coaches and medical experts have known for a while that the severe hits that football players take on the field can lead to concussions, blackouts, and even permanent damage. More recently, however, there has been increasing concern that the effects of repeated hits to the head may not manifest themselves until decades later. Early studies suggest that former National Football League (NFL) players suffer high rates of memory and other cognitive problems years after retiring and that they also may develop these problems earlier than non-football players do.
Do you think that football playing should be stopped? Should the rules of the game be changed to eliminate hard hitting? Is the risk of permanent cognitive disability different than the risk of permanent physical disability? Wrestlers, soccer players, boxers, and other types of athletes are also at risk for long-term brain damage. Should these sports be changed or banned? How did the information in this unit influence your opinions?