$121$ point

In marketing, a "sample" is defined as$?$

Everyday information about developments in the marketing environment that helps managers prepare and adjust marketing plans

A segment of the population selected for marketing research to represent the population as a whole.

Marketing research to gather preliminary information that will help define problems and suggest hypotheses.

The gathering of primary data by selecting matched groups of subjects, giving them different treatments, controlling related factors, and checking for differences in group responses.