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樣本大細(粵拼:joeng6 bun2 daai6 sai3;英文:sample size)係指一個樣本入面嘅個體數量。喺統計學上,樣本大細要點樣決定係一個重要課題。
喺現實應用上,因為人力物力限制,研究者往往冇辦法做到「樣本有咁大得咁大」,不過會起碼想啲樣本「有返咁上下大」,仲會有啲特定嘅式,用嚟計「樣本最少要係幾大」[1]。
喺廿一世紀初嘅統計學應用當中,樣本大細係一個相當重要嘅數值。啲人做親統計分析,基本實會睇睇場分析用嗰個樣本有幾大。如果一場分析樣本細,就表示手上嘅資訊量少,而呢點就表示分析者對於「呢場測試係咪真係能夠探測到實質存在嘅效果」(統計功效)存疑。
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