Sampling is applied to reports before segmentation?

Correct Answer is: False

Explanation:

The data sampling can occur when you apply segments, secondary dimensions, or filter reports in Google Analytics. Whenever a standard report is modified as well as when a custom report is created, Google will have to query the data in a dedicated way, crossing information that it does not already have available (as is the case with standard reports). 

A segment is a set of dynamic data that allows you to cut off part of the audience according to a specific criterion and analyze data with general traffic or other segments.

We can single out a group of users according to certain criteria and compare them with other groups. This will allow you to understand what distinguishes these users, which paths they took, from which traffic sources they came.