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2. Thomas is trying to take a survey on the average monthly sales of shopping mall
in the 3rd street. Determine whether the sampling is biased or unbiased
a. Thomas selected 10 grocery stores.

b. Thomas randomly selected 10 stores.

c. Thomas selected 20 stores that were closest to the house.

d. Thomas selected 20 stores that have more than 2 floors.

e. Thomas selected 10 stores that are expected to have the highest sales.

f. Thomas ordered the entire stores alphabetically, and selected every 10th store.
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