Understand statistics as inference about population parameters from random samples.
Identify the type of sampling bias in a survey or study description
Problem
What kind of sampling bias appears in this study: call only landline phones for youth opinion poll?
Big Picture
What this problem is really about
Locate when the distortion enters the study. If a target subgroup is absent from the reachable frame, the problem is undercoverage before contact occurs; nonresponse begins only after sampled people fail to reply. Voluntary response instead comes from self-enrollment, while response bias concerns how answers are elicited or reported.
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