Explanation 1
Population mean: average for every target-population member.
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Lesson 6 of 12
Connect target populations, frames, samples, censuses, parameters, and statistics in a practical study plan.
Theory
The target population is the group the claim is about. The sampling frame is the list or system used to reach that group. A sample is a subset; a census attempts to measure every unit. A parameter describes the population, while a statistic describes the sample.
Explanation 1
Population mean: average for every target-population member.
Explanation 2
Sample mean: average from selected units.
Explanation 3
Coverage gap: frame misses part of the target population.
Interactive Mission
Population mean
82.2
Sample mean
80.9
R connection
Use sample() and seq() to simulate sample selection from a student frame.
Live R Lab
Use set.seed(), sample(), replacement choices, and seq() to create reproducible samples from a frame.
Ready to run
Worked example
Scenario
If an online course has 85 active learners, a census survey may be feasible. If it has 85,000 learners, a sample with a credible frame is usually more practical.
Sample quality depends on design, not just count.
Assistant
Help me define target population, sampling frame, sample, census, parameter, and statistic for my own study idea.
Exit check
Use the hint button if you need coaching before answering. Explanations appear after you check or submit.
Checkpoint
Question 1 of 2. Answered 0/2. Passing score: 70%.