توضیح 1
Population mean: average for every target-population member.
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درس 6 از 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.
توضیح 1
Population mean: average for every target-population member.
توضیح 2
Sample mean: average from selected units.
توضیح 3
Coverage gap: frame misses part of the target population.
فعالیت تعاملی
Population mean
82.2
Sample mean
80.9
ارتباط با R
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
مثال حلشده
سناریو
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.
دستیار
Help me define target population, sampling frame, sample, census, parameter, and statistic for my own study idea.
ارزیابی پایانی