Getting recommended by a teacher is not a method of Random Sampling and can be use to assign students to a treatment group, the correct option is A.
What is Random Sampling ?
The sampling technique in which everyone has the equal chance of being chosen. This is not a very well researched method so the deviated results of sampling and the chances of error increases.
To randomly assign students to a treatment group the technique used should not be random.
Flipping a coin, rolling a die, choosing a card from a fair deck are methods of Random Sampling.
Getting recommended by a teacher is not a method of Random Sampling and can be use to assign students to a treatment group.
Therefore, the correct option is A.
To know more about Random Sampling
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