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Mr. Johnson looked at 3 different problems from each test given last year. Each test had the same number of problems. Is this sample of the test problems assigned likely to be biased?
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Mr. Johnson looked at 3 different problems from each test given last year. Each test had the same number of problems. Is this sample of the test problems assigned likely to be biased?

User Lucyna
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the answer should either be b or d but i’m not sure sure
User StatBeginner
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