In which situation would the addition of a don't know response be ...

[Pineappleeh]

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.

Question 2

What is the upper limit on the number of scale positions?
 a. 5
  b. 7
  c. 9
  d. 10
  e. There is no limit.

[yuyiding]

Answer to Question 1

b

Answer to Question 2

E

[Pineappleeh]

TYSM

[Bigfoot1984]

Gracias!