Big Deal department store wants to conduct a survey of its customers to determine which type of promotion they prefer:

Question

Big Bucks, which they earn each time they shop, or
Power Points, which they can redeem for coupons
They will ask their customers, “Which promotion do you prefer, Big Bucks or Power Points?” Which of the following methods of surveying their customers will allow Big Deal to make valid conclusions about their customers' preferences?
Choose 1 answer:
Choose 1 answer:
(Choice A) Ask customers who are redeeming Big Bucks which they prefer.
A
Ask customers who are redeeming Big Bucks which they prefer.
(Choice B) Ask every customer who shops on a particular Saturday between

and

for the Early Bird Promotion.
B
Ask every customer who shops on a particular Saturday between

and

for the Early Bird Promotion.
(Choice C) For a period of a year, ask every hundredth customer who enters the store which they prefer.
C
For a period of a year, ask every hundredth customer who enters the store which they prefer.
(Choice D) Ask

customers who are shopping at Big Deal's competitor, Shop Til You Drop.
D
Ask

customers who are shopping at Big Deal's competitor, Shop Til You Drop.

Answer 1

The best method for Big Deal department store to make valid conclusions about their customers' preferences would be Choice C: For a period of a year, ask every hundredth customer who enters the store which they prefer. This method ensures that a diverse range of customers are surveyed, rather than just those redeeming one type of promotion or those shopping on a specific day or at a competitor's store.