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:

To find the average data usage of smartphone customers, the sample should be relevant to smartphone data - plan users. Customers with the most expensive plans may not be representative (could have different usage patterns due to plan perks). Newly - signed - up customers might have different usage as they are still getting used to the service. Customers who called for technical support may have issues that affect data usage (not a general sample). Customers with a current smartphone data plan are directly related to the population of interest (smartphone data - using customers).

Answer:

one thousand of their customers with a current smartphone data plan