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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The Answer of 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.

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