For an assignment, students are asked to gather data on the mode of transport to

Question

For an assignment, students are asked to gather data on the mode of transport to camous. Three students have different approaches to gather these data. Which approach is giving a probability sampling plan?

i. student A created an online questionnaire and asked his friends on facebook to help him spread the message.

ii. student B asked computer center to help her by sending an email to all students, asking about their opinion

iii. among all the lectures given throughout a week, student C randomly selected 100 module's lecture and interviews the first student who comes out of the classroom after lecture finishes.

iv. none of the above

Explanation / Answer

A probability sampling method is any method of sampling that utilizes some form of random selection. In order to have a random selection method, you must set up some process or procedure that assures that the different units in your population have equal probabilities of being chosen.

Here clearly we see that the student iii among all the lectures given throughout a week, student C randomly selected 100 module's lecture and interviews the first student who comes out of the classroom after lecture finishes and therefore (iii) is the correct answer here.

The first 2 students are using different modes of questioning students and it is therefore not random.

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