1. most if not all went to top league institutions
2. most if not all came from affluent homes
3. most if not all serve vested interests that isn't in the public good
4. most if not all are men
5. most if not all are the same age group
and more
Answer:
History
Explanation:
The history of the students in relation to their mathematical skills is a potential threat to validity of the experiment.
Personal biases that interfere with objective rationality in decision making are called psychological biases.
It was not necessary since all of the natural were located on the coast.
