The correct answer is: all of the above are true.
In order for a psychological study's findings to accurately represent the target population, the study's sample needs to be chosen accordingly. To elaborate, the sample should be:
i) Randomly chosen- this avoids any bias and leads to a more diverse sample from the target population
ii)Representative of the whole group- so that individuals from the target group are not excluded
iii) Representative in terms of demographic traits (age, region, religion, race, and the like)- so that all subgroups, races, religions, age, etc., from the target population are represented
iv) Representative in terms of opinions- Even within a target group, members have varying opinions. Random sampling ensures that various opinions are represented.
