Statistical Literancy considerr a completely randomized expe

Statistical Literancy

considerr a completely randomized experiement in which a control group is given a placebo for congestion relief and a treatment group is given a new drug for congestion relief. Describe a double-blind procedure for this experiment and discuss some benefits of such a procedure.

Critical Thinking

A brief survey regarding opinions about recycling was carefully designed so that the wording of the quesitons would not infuence 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 sielently whicle 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?

Please read and solve, thank you.

Solution

Are the respondents a random sample of people in the community?

No, because she went to a farmer\'s market, which means that only people that go there have a chance to answer the survey.

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Are there any concerns that Jill might have influenced the respondents?

She was wearing a green \"fight global warming\" t-shirt, which may influence the answerer to go for more conservative answers if he isn\'t really into recycling, or may give more extreme answers when the answerer is already inclined into recycling.