【单选题】【消耗次数：1】
通过一定的控制手段观察测量自变量和因变量之间的变化规律是( )。
①
实证研究法
②
理论研究法
③
观察法
④
调查法
参考答案：
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【判断题】
在研究设计中，变量指在数量、性质上可以变化、测量、操纵、控制或观察的条件、现象、事件或事物的特征。变量的简单分类包括三种形式：自变量、因变量和混合变量。
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正确
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