Question

How is this wrong?

Answer 1

A census DOES ask everyone. A sample survey uses a sample to make conjectures about the entire population. So the actual group being studied IS the population. For the second question, the sample is the group you're surveying.

Answer 2

The **population** is the **whole set** of study, i.e. all professionals

The **sample** is the **subset** of study, i.e. just 410 professionals

This **survey** analyzes the population **indirectly**, by analyzing a sample **directly**. The quality of the data depends on how you select the sample (size, variety etc)

Answer 3

My understanding is that the population is everyone *who is being surveyed*, not the *entire group of people*, because that would be a census, and then sample would be a percentage of the people surveyed.