A researcher would like to determine the proportion of cities that has a semiautomated waste management system. The student wants to estimate the population proportion with a margin of error of .10,...

A researcher would like to determine the proportion of cities that has a semiautomated waste management system. The student wants to estimate the population proportion with a margin of error of .10, prefers a level of confidence of 90%, and has no estimate for the population proportion. What is the required sample size?