4-13 Go to www.surveysystem.com/sscalc.htm to determine the appropriate sample size for a population of 115 million households (the number for the US). Assuming a confidence interval of 5, how large should the sample of households be if desiring a 95 per cent confidence level?

How large for a 99 per cent confidence level? Briefly explain what is meant by confidence interval and confidence level. (AACSB: Communication; Use of IT; Analytical reasoning)