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According to a survey of 1,235 businesses by IDC, a market-research concern in Framingham, Massachusetts, 12.1% of sole proprietors are engaging in e-commerce (The Wall Street Journal, July 26, 2007).,a. With 95% confidence, what is the margin of error when estimating the proportion of sole proprietors that engage in e-commerce?,b. Construct a 95% confidence interval for the population proportion.Quantity 1 Buy Ready Solution [ instant answer]

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