You are doing a survey about the smoking habits of the students of your university and want to reach a 20% sample. Here

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You Are Doing A Survey About The Smoking Habits Of The Students Of Your University And Want To Reach A 20 Sample Here 1 (304.96 KiB) Viewed 47 times

You are doing a survey about the smoking habits of the students of your university and want to reach a 20% sample. Here are some potential sampling rules. Would each lead to a representative sample? Why or why not? (1) Stand at the main entrance and select every fifth entering student. (2) Get the students' email list from the administration and select every fifth person in alphabetic order. (3) The same, but select the first fifth of the students in alphabetic order. (4) The same, but now sort the students according to a random number generated by a computer and select the first fifth of them.