The selection of research participants was not arbitrary; it followed a stratified sampling method to ensure representativeness.
研究参与者的选择并非随意，而是遵循分层抽样方法以确保代表性。
Which choice best defines “arbitrary”?
D — Random and capricious; unreasonable. “arbitrary” means Random and capricious; unreasonable.
Which word means “Random and capricious; unreasonable”?
D — arbitrary. “arbitrary” means Random and capricious; unreasonable.
arbitrary — Random and capricious; unreasonable. In Chinese: 武断的，随意的.
arbitrary is pronounced /ˈɑːrbɪtrəri/.
The selection of research participants was not arbitrary; it followed a stratified sampling method to ensure representativeness. (研究参与者的选择并非随意，而是遵循分层抽样方法以确保代表性。)
random, capricious, unreasonable — all close in meaning to arbitrary (Random and capricious; unreasonable).
systematic, rational — each the opposite of arbitrary (Random and capricious; unreasonable).
Yes. arbitrary is on the SAT Prep Easy list — mid-frequency academic words that do get tested. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
arbit(judgment) + ary→ capricious, random.