Match the items on the right to the items on the left.

1. The best research approach for investigating the effect of one variable on another.	??? survey field research experiment use of available data
2. A key feature of this research approach is generalizing about a group based on information collected from part of the group.	??? survey field research experiment use of available data
3. Investigators using this approach try to gain firsthand knowledge by immersing themselves in the setting under study.	??? survey field research experiment use of available data
4. Historians often use this approach to study the distant past.	??? survey field research experiment use of available data