Q6. A researcher believed that there is a biological basis to aggression in males. She
predicted that there would be a significant difference between the levels of the hormone
testosterone in aggressive males and the levels of the hormone testosterone in
non-aggressive males. In order to test her prediction, the researcher statistically analysed
the levels of testosterone in saliva samples from 20 aggressive males and 20
non-aggressive males.
Outline three ways in which the study described above could be considered to be
scientific.