In a Study About Poverty Level by County, the Number

Short Answer

In a study about poverty level by county, the number of residents living below the poverty level was measured for a random sample of 40 counties with less than 500 residents living below the poverty level. The sample mean and standard deviation were found to be 307 and 145 residents, respectively. Use these data to construct a 98% confidence interval for the mean of the number of residents by county living below the poverty level. Round your answer to the nearest integer.