Question

The Census Bureau of the US Department of Commerce estimated that average e-commerce sales for US retailers in the second quarter of 2011 had increased by 3.0 percent from the first quarter of 2011. Along with the estimate, a margin of error of 1.2 percent (at the 95% confidence level) was reported.
a. Show the upper and lower bounds for the 95% confidence interval.
b. What would the margin of error be for a 90% confidence level?


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  • CreatedJuly 16, 2015
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