Answer:
The man will forget how to build a fire
Pure competition - Online auctioning
Monopoly - Cable company
Monopolistic competition - Gas stations
Oligopoly - Airlines
The problem with self selection in research is that it makes it makes causal interpretations difficult.
<h3>What is self selection?</h3>
This is a type of bias that occurs often times in social science research. In this type of bias, the respondents cause it because they are totally allowed to decide things for themselves.
The respondents are left to decide for themselves whether they want to participate in the research or not.
Read more on self selection here:
brainly.com/question/25261401
The control group is the group that is not changed in any way.
Here are the dates: He made 4 trips across Atlantic Ocean from Spain: 1492, 1493, 1498 and 1502.
