To do research on the psychological effects of birth order,what should a researcher do?

Question

To do research on the psychological effects of birth order,what should a researcher do?​

Quizplus · Accepted Answer

Limiting the study to people from families with at least two children is necessary to investigate the psychological effects of birth order. Birth order refers to the order of siblings' births within a family, so families with only one child would not provide any information on birth order effects. Limiting the study to people who attended public schools, whose parents are happily married, or who are known to be similar to one another in personality may not be relevant to investigating birth order effects.

To Do Research on the Psychological Effects of Birth Order,what