Data Collectionhard
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A polling firm uses quota sampling to interview 1,000 voters at a shopping mall, targeting 40% Democrats, 35% Republicans, 25% Independents (matching population proportions). Interviewers are instructed to meet quotas by selecting "approachable-looking" voters they encounter. Why is this approach problematic despite achieving correct population proportions?
A polling firm uses quota sampling to interview 1,000 voters at a shopping mall, targeting 40% Democrats, 35% Republicans, 25% Independents (matching population proportions). Interviewers are instructed to meet quotas by selecting "approachable-looking" voters they encounter. Why is this approach problematic despite achieving correct population proportions?