確かく率りつ標ひょう本ほん

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Meanings

1

noun

random sample

Technical term in statistics for a sample selected by a random process, ensuring each member of the population has a known chance of inclusion.

確assurance, firm, tight

率ratio, rate, proportion

標signpost, seal, mark

本book, present, main

無む作さく為い抽ちゅう出しゅつ
無作為抽出 refers to the process of random sampling, while 確率標本 is the resulting sample itself.
標ひょう本ほん
標本 is a general term for a sample, not necessarily random; 確率標本 specifies a probability-based sample.

Compound of 確率 (probability) and 標本 (sample). A modern technical term formed from existing Sino-Japanese elements.