Evaluating result with confidence and margin of error

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Q1) Pilot survey of ages of country residents is taken and originally shows and average age of 33.5 years with standard deviation of= 5.2 years. Researcher now wishes to do a full survey and to create the estimate of average age of population of country residents with 95% confidence and with precision of evaluate of plus and minus 1.5 years. How large sample will be needed?

Q2) In the political survey , where opponents are probable to be relatively close in terms of percent of vote that they will receive, how large random sample of potential voters will be required to evaluate result with 95% confidence and with margin of error of plus and minus 3%?

Reference no: EM1313894

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