sample size in decision broblem

例句：

1. 1.The study used a sample size of 500 participants to test the effectiveness of the new treatment.
   该研究使用了500名参与者的样本量来测试新治疗的效果。
2. 2. The research team carefully selected a representative sample size for their study.
   研究团队精心挑选了代表性的样本大小进行他们的研究。
3. 3. The data from the survey was used to estimate the sample size needed for future studies.
   调查数据被用来估计未来研究的样本大小需求。