The administrators of the city's Stormwater Program areinterested in evaluating the public's knowledge of the causes andeffects of stormwater pollution. They set up an information boothat the city's Earth Day celebration, and people who visit the boothare offered the opportunity to complete a survey on their knowledgeof stormwater pollution.

(a.) If the population of interest is adult residents of thecity, discuss any sources of bias that might limit the usefulnessin using this survey to draw conclusions about this population.

(b.) The survey at the Earth Day celebration was intended to beused as a pilot study to make sure the questions were notambiguous. The full survey is to be an online survey. Residents areto be made aware of the survey through information mailed withtheir utility bills, and asked to go online to complete the survey.Discuss any sources of bias that might be contained in the fullsurvey.

(c.) Suppose we select a random sample of utility customers.Only the residents in the sample are to be made aware of the surveythrough information mailed with their utility bills, and asked togo online to complete the survey. Does this have any advantages ordisadvantages over the full survey in part (b) in terms of possiblebias? Explain.