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A survey organization conducts a mail survey on customer satisfaction. In Phase 1, they mail surveys to n₁ = 5,000 customers at $0.50 per survey, expecting a 50% response rate (~2,500 respondents, total cost $2,500). In Phase 2, they plan telephone follow-up with non-respondents at $8 per contact (higher response rate but higher cost). Compared to a single-phase telephone survey of all 5,000 customers at $8 each (total $40,000), which advantages does the two-phase design offer? (Select all correct answers.)
A survey organization conducts a mail survey on customer satisfaction. In Phase 1, they mail surveys to n₁ = 5,000 customers at $0.50 per survey, expecting a 50% response rate (~2,500 respondents, total cost $2,500). In Phase 2, they plan telephone follow-up with non-respondents at $8 per contact (higher response rate but higher cost). Compared to a single-phase telephone survey of all 5,000 customers at $8 each (total $40,000), which advantages does the two-phase design offer? (Select all correct answers.)