Sample Size
The number of observations or measurements collected, which affects statistical power and the precision of estimates.
Formula
Standard Error = s ÷ √n
Real World
When the RSPB surveys red kite populations, ornithologists increase quadrat counts in areas of suspected low density to maintain statistical power — a small sample in a sparse population would miss real trends.
Exam Focus
When asked to 'evaluate' sample size, always link n to precision and statistical power, not just accuracy — these are distinct concepts examiners distinguish.
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