I believe the answer is Observational study
In an observational study, the data input couldn't be controlled by researchers because it's relative to the subject.
This type of study usually being conducted in researchers that involve ethical measurement or Personal opinion.
Answer:
Sorry I don't get your question
Answer:
The order of answers is given: 2, 1, 2, 2, 1
Explanation:
hope this helps, brainliest if it does!
It is because the serial position
effect means the inclination in people to remember the first items and the
last in a list in more detailed manner than those coming in the middle, George
want to use this for his benefit. The person who discovered the serial position
effect was Hermann Ebbinghaus.