Answer:
C
Explanation:
it should be all of them really but c and d are the best options so I would go with c
a control group is making an observation
Answer:
A
Explanation:
I searched it up and it told me the similar answer like the one a has
Answer: Probabilistic
Explanation: This kind of sample is probabilistic, a random sampling. In this kind of sampling you select a group of students (in this case) among the totality of the high-schools that were randomly selected. This allows the investigation to be more trustworthy and accurate.
