Question

A manager at a phone company wants to know if the company’s current customers would be interested in a new calling plan.

Which sampling method will most likely result in a biased sample?
A.
An office assistant divides the customers by time zone and randomly selects 100 customers in each zone.
B.
An office assistant selects every 50th name on a customer list.
C.
An office assistant selects the customers who call the office with questions about their current plan during one week.
D.
An office assistant programs a computer to randomly select 500 customers from its database.

Answer 1

@Mertsj Any idea's ??

Answer 2

C