4. John wanted to determine the average cost of renting a two-bedroom apartment in the Indianapolis area. To save time, he called 20 college friends who lived in two-bedroom apartments and asked them how much rent they paid. He then used these figures to get his estimate. Answer the question below based on this story.

What do we know about John's results?

Group of answer choices

a. John's results are accurate even though he did not use randomization, because he was doing an experiment and randomization is not necessary.

b. John's results will have more variability than they would have if he had collected the data using a randomized sampling design.

c. John's results are biased since he only asked his college friends, who would be more likely to rent apartments closer to campus.

5. John wanted to determine the average cost of renting a two-bedroom apartment in the Indianapolis area. To save time, he called 20 college friends who lived in two-bedroom apartments and asked them how much rent they paid. He then used these figures to get his estimate. Answer the question below based on this story.

Which type of sampling bias did John's study most likely suffer from?

Group of answer choices

a. Convenience sample

b. No answer text provided.

c. Voluntary response

d. Non-response