A brief survey regarding opinions about recycling was carefully designed so that the wording of the questions would not influence 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 might have influenced the respondents?