Randomeness has types ??... thinking...

This post is with reference to the post by Hemangi 'Is randomeness only of one type?' ref. http://metca6research.blogspot.com/

Thedifference between the two examples:
Example 1:

• The sample is selected from sample frame randomly
• Survey is conducted

Example 2:

• The sample is not selected from sample frame randomly. But it is selected from a particular group from the sample frame randomly.
• Experiment is conducted by forming 2 groups which are tested on two different independet variables.