被験者は無作為に抽出された。
tbd
The people for the experiment were chosen at random.
The subjects for the experiment were chosen at random.
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実験用の被験者は無作為に選ばれた。
tbd
The subjects for the experiment were chosen at random.
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その世論調査は無作為に選ばれた成人に基づいてなされた。
tbd
The opinion poll was based on a random sample of adults.
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アンケート用紙が無作為に配布された。
tbd
The questionnaires were distributed at random.
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