A brief survey regarding opinions about recycling was carefully designed so that the wording of the questions would not influ-
ence the responses. Jill administered the survey at a farmer's market. She
approached adults and asked if they would fill out the survey, explaining that
the results might be used to set trash collection and recycling policy in the
city. She stood by silently while the form was filled out. Jill was wearing a
green T-shirt with the slogan “fight global warming." Are the respondents a
random sample of people in the community? Are there any concerns that Jill
minht have influenced the respondents?