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You want to know the opinions of American school teachers about establishing a national test for high school graduation. You of the members ofthe National Education Association (the largest teachers' union) and mail a questionnaire to 250 teachers chosen at random from the this list In all 1347 teachers return the questionnaire. 1. Will this sampling method introduce bias? Explain. a test for high 2. lfmany samples were taken using this method would the sample proportions of those want national that 3. school graduation be accurate? Explain. want a national test for high many samples were taken using this method would the sample proportions of those that school graduation be precise. Explain.

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