Understand statistics as inference about population parameters from random samples.
Separate population, frame, sample, unit, and size
Problem
A study selects \(500\) voters from the city voter-registration list to estimate the preference of all registered city voters. Identify the target population, sampling frame, sample, and observational unit.
Big Picture
What this problem is really about
Separate the study roles by asking four different questions: whom the conclusion is meant to describe, which list made people reachable, who actually supplied data, and what one row of data represents. Those answers identify the target population, sampling frame, sample, and observational unit. The sample size is simply the number of units in the observed subset.
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