According to a survey of 1 235 businesses by IDC a
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.

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