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In Which Situation Would the Addition of a "Don't Know

Question 29

Multiple Choice

In which situation would the addition of a "don't know" response be most advisable?


A) A retail store randomly selects names from the customer database.
B) A department store randomly selects respondents from the local telephone directory.
C) A convenience store hands out questionnaires to every fifth customer.
D) Both a and b.
E) a,b,and c.

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