Question

Please help I don't get it :(

Answer 1

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 the customers who call the office with questions about their current plan during one week.

C.
An office assistant selects every 50th name on a customer list.

D.
An office assistant programs a computer to randomly select 500 customers from its database.