According to a survey of 1,235 businesses by IDC, a marketresearch concern in Framingham, Massachusetts, 12.1% of
Question:
According to a survey of 1,235 businesses by IDC, a marketresearch concern in Framingham, Massachusetts, 12.1% of sole proprietors are engaging in e-commerce (The Wall Street Journal, July 2 6 , 2007).
a. What is the margin of error in estimating with 95%
confidence the proportion of sole proprietors that engage in e-commerce?
b. Construct a 95% confidence interval of the population proportion. P-69
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