Consider the task of measuring the proportion of students at a university who wash (or don't wash) their hands after using the restroom. (a) Describe an (ethical) method of surveying relevant data to estimate this quantity. What variable or variables do you record, and how do you select your sample? (b) What flaws might present themselves when surveying respondents about a subject that may be personal or embarrassing? (c) In the context of this problem, would this lead to a high or low estimate of the true proportion of students who wash their hands after using the restroom? (d) Describe a (potentially unethical) method of collecting relevant data that would avoid this prob- lem.