Get Full Access to Grade 7 Mathematics - Skill Builder + New York State Test (NYST) Rehearsal
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John comes up with the following methods for generating unbiased samples from shoppers at a mall.
I. Ask random strangers in the mall
II. Always go to the mall at the same time of day
III. Go to different places in the mall
IV. Don't ask questions the same way to different people
Which of these techniques represents the best way of generating an unbiased sample?
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