Asocial scientist plans a study of adult South Asians to investigate educational attainment in women. In some parts, the women are not required to attend school, so some of them had very little education. How large a sample size is needed so that a 95% confidence interval for the mean number of years of education completed has margin of error equal to 1 year? There is no information about the standard deviation of educational attainment, but researchers expect that nearly all values fall between 0 and 18 years.