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A survey of 1,000 adults asks about household income. The response rate is 70% (700 respondents report mean income = $62,000). Of the 300 non-respondents, 100 are later contacted by intensive phone follow-up and report mean income = $40,000. Assuming the remaining 200 unreached non-respondents match the follow-up group's distribution, what is the bias in the originally reported average?
A survey of 1,000 adults asks about household income. The response rate is 70% (700 respondents report mean income = $62,000). Of the 300 non-respondents, 100 are later contacted by intensive phone follow-up and report mean income = $40,000. Assuming the remaining 200 unreached non-respondents match the follow-up group's distribution, what is the bias in the originally reported average?