As reported by tradingeconomics.com on September 2, 2012, the unemployment

As reported by tradingeconomics.com on September 2, 2012, the unemployment rates (in %) in major economies around the world are as follows:,Country Unemployment Rate (in %),Australia……………………….. 5.2,China……………………….. 4.1,France ……………………….. 10.0,Germany……………………….. 6.8,India ……………………….. 3.8,United Kingdom………………… 8.0,United States ………………………. 8.3,a. Calculate the margin of error used in the 95% confidence level for the population mean. Explain the assumption made for the analysis.,b. How can we reduce the margin of error for the 95% confidence interval?