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The Census Bureau of the US Department of Commerce estimated that average e-commerce sales for US retailers in the second quarter of 2011had increased by

The Census Bureau of the US Department of Commerce estimated that average e-commerce sales for US retailers in the second quarter of 2011had increased by 5.2 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. Please show the upper and lower bounds for the 95% confidence level.

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