Video 1:
Instead of asking each and every person in the population (which would take a long time) you can choose some random students to answer the question which will give you a good idea for the entire group.
Video 2:
Unbiased samples need to be random.
Video 3:
Convenience Sample can be biased because they could be friends and have the same ideas leaving it to what they agree on together because they are friends.
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