Sampling question?

Question

1. Your friend conducted a study on the number of calories in bottles of sports drinks. He went to his kitchen and recorded the calories of the sports drinks in the refrigerator. What kind of sampling was conducted?
2. Clemson University and The University of South Carolina have approximately the same number of season ticket holders. 1000 individuals were randomly selected from each fan base to determine the income of season ticket holders. What type of sampling was conducted?
3. A deck of cards were shuffled five times by your friend. Then he fanned out the deck so that you could not see the face value of the cards and asked you to choose 3. What type of sampling was conducted?

Answer 1

1. This is called convenience sampling. Your friend sampled the objects, in this case sports drinks, that were easily accessible to him.
2. This is simple random sampling.
3. This is also simple random sampling, but it could be seen as systematic random sampling because he shuffled the deck exactly five times. This question is also a bit more ambiguous because we don't know if you are putting the card back into the deck each time or not.