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For the following, describe the target population, sampling frame, sampling unit and observation unit. Is there any selection bias or inaccuracy of responses?

The article "What readers say about Marijuana" (Parade, July 31, 1994, p.6) reported "More than 75% of the readers who took part in an informal PARADE telephone poll say marijuana should be as legal as alcoholic beverages. "The telephone poll was announced on page 5 of the June 12th issue; readers were instructed to "Call 1-900-773-1200, at 75 cents a call, if you would like to answer the following questions. To participate, call between 8 am EDT on Saturday, June 11th and midnight EDT on Wednesday June 15th.

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