Which of the following does not constitute a random sample of the population of

Question

Which of the following does not constitute a random sample of the population of interest? Select one: a. To estimate the average fuel price in Sydney, a fuel analyst collects data on the price of fuel from 100 petrol stations. The petrol stations were selected at random using a computer program. b. A tree enthusiast is interested in estimating the typical length of oak tree leaves. He chooses 30 leaves from the oak tree in his backyard. c. A retail analyst wants to estimate the average number of M&Ms; in a 500g packet. She buys ten packets from 10 different supermarkets around Canberra and counts the number of M&Ms; in each packet using her lolly counting machine and computes the sample average. d. A campus bookstore is holding a drawing to give away five free textbooks (one per student). Students enter the contest by writing their name and contact information on an index card. The index cards were placed in a bowl, thoroughly mixed around, and five cards were selected. Those five students were contacted and received their free textbook.

Explanation / Answer

d)

A campus bookstore is holding a drawing to give away five free texbooks (one per student).Students enter the contest by writing their name and contact information on an inindex card.yhe index card were placed in bowl, throughly mixed around, and five cards were selected.Those five students were contacted and received their free texbbok.

Does not constitute a random sample of the population of intreast. So option d is correct.

Options a,b and c are estimtes from their respective samples. Means sample information is used to estimate population parameter such as average fuel price, typical length of oak tree leaves and average number of M&Ms in a 500g packet.

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