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Question: scenario 3 in an attempt to understand the nations opinion...

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Scenario 3: In an attempt to understand the nations opinion on universal healthcare, investigators sponsored an advertisement during an American mid-moming news radio that asked viewers the following question: Should everyone have healthcare? Weigh in tonight from 4 to 6pm. If yes, call 1-900-720-6181. fno, call 1-900-720-6182. Charge is 50 cents for the first minute. Consider the population that the investigators are trying to sample, do they obtain a representative sample from this sampling scheme? Specifically, what type of sampling scheme has been used? What type of sampling bias(s) may have occur? What else could be a source of issue when it comes to this scenario?
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