The study sounds simple, but the design of the experiments was actually somewhat complex, because the researchers had to overcome a number of confounding variables.
这个实验听起来很简单，但是实验的设计确实有一定程度的复杂性，因为研究人员不得不克服一些混淆变量。
They also knew that, by working with surveys from three countries, and with such a wide range of ages, they would diversify the data and iron out confounding variables.
他们也明白研究三个国家的调查结果，而且是这么广的年龄跨度，他们能使数据多样化且消除混杂变量。
Internal validity: the degree to which the results of a study can be attributed to the treatment rather than extraneous or confounding variables.
内部效度：一个实验结果归咎于实验处理，而非归咎于无关的混淆的变量的程度。
Understand why multiple regression techniques allow for the analysis of the relationship between an outcome and a predictor in the presence of confounding variables.
了解为何复回归允许在有干扰变数的情况下，分析单一结果和预测变项的关联性。
Understand why multiple regression techniques allow for the analysis of the relationship between an outcome and a predictor in the presence of confounding variables.
了解为何复回归允许在有干扰变数的情况下，分析单一结果和预测变项的关联性。
应用推荐