00:01
Okay, in question 28, you're asked to describe two other methods for collecting information other than a census.
00:09
So i want to back up and make sure that you first understand the two primary categories that we use to gather information.
00:19
And that is that we're either going to look at an observational study of which a census is one kind, or we're going to design an experiment with the control.
00:29
Most of this book will concentrate on types of observational studies and specifically sampling because it's much easier than doing a census.
00:40
So, but let's just review, make sure you understand.
00:42
In an observational study, you just look or ask questions.
00:48
You try not to influence what is happening in any way.
00:52
You merely observe and collect data and observations.
00:56
And then remember, a census is where you.
00:58
You observe every possible member of your set...