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Samples and Populations

prissyg

New member
Joined
May 8, 2012
Messages
1
Does a researcher define the POPULATION under study?
Why do sampling errors occur?
What happens when we increase the level of confidence from 95% to 99%?(is it that we lose precision but gain certainty that our answer is accurate?)
 

tkhunny

Moderator
Staff member
Joined
Apr 12, 2005
Messages
9,708
Does a researcher define the POPULATION under study?
I sincerely hope so.

Why do sampling errors occur?
A little vague. Do youmean the estimation error due to sampling or do you mean straight up getting the sample wrong?

What happens when we increase the level of confidence from 95% to 99%?(is it that we lose precision but gain certainty that our answer is accurate?)
I don't understand "lose precision" in this context. The interval is wider. Is that what you mean? Should we talk about Type I and Type II Error, here?
 
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