Question

a cell phone company wants to determine the average amount of data that their smart phone customers use each month. which group would best represent a sample of the population?
one thousand of their customers with the most expensive monthly plans
one thousand of their customers who most recently signed up with the company
one thousand of their customers with a current smart phone data plan
one thousand of their customers who called in for technical support

Explanation:

The goal is to select a sample that accurately represents the population of the company's smartphone customers using monthly data. A valid sample should match the population's key trait (smartphone data plan users). The first option overrepresents high-cost plan users, the second only new customers, the fourth only those needing tech support—all are biased. The third option targets customers with active smartphone data plans, matching the population we want to measure.

Answer:

one thousand of their customers with a current smart phone data plan