Question

big deal department store wants to conduct a survey of its customers to determine which type of promotion they prefer:
. 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:
a ask customers who are redeeming big bucks which they prefer.
b ask every customer who shops on a particular saturday between 8 a.m. and 10 a.m. for the early bird promotion.
c for a period of a year, ask every hundredth customer who enters the store which they prefer.
d ask 100 customers who are shopping at big deals competitor, shop til you drop.

Explanation:

To make valid conclusions about all customers' preferences, a representative sample is needed. Option A only asks customers redeeming Big - Bucks, which is a biased sample. Option B only surveys customers during a specific time on a particular day, which may not represent all customers. Option D asks customers at a competitor, not Big Deal's own customers. Option C, asking every hundredth customer over a year, is a form of systematic sampling that can provide a more representative sample of all Big Deal customers.

Answer:

C. For a period of a year, ask every hundredth customer who enters the store which they prefer.