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What’s the answer to number 13 14 and 15

What’s the answer to number 13 14 and 15-example-1

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Answer:

14. It is biased, because the store manager sends the survey to a customer who registered. I will send the survey to a customer who is not registered and who is new to the store.

15. This is unbiased, because they chose the students randomly.

Explanation:

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