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1. David wants to sample his market for a pizza shop. A market study conducted last year indicated that 45% might visit his pizzeria. How

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1. David wants to sample his market for a pizza shop. A market study conducted last year indicated that 45% might visit his pizzeria. How big a sample does he need to have a margin of error of plus/minus 5%, 19 out of 20 times? 2. Assume that David in Q1 has decided to change his margin of error to plus/ minus 2%, how big a sample size does he need? Has it changed from question 1

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