In August 2005, researchers for the American Society for Microbiology and the Soap and Detergent Association monitored the behavior of more than users of public restrooms. They observed people in public venues such as Turner Field in Atlanta and Grand Central Station in New York City. They found that of men washed their hands, compared to of women.
a. For each gender, construct a 90% confidence interval for the population proportion who wash their hands in public restrooms.
