extraneous variable

基本解释

Again, no extraneous or random variables can enter into the equation.
再次申明，外部的和隨機的變數不能乾擾這個過程。
More bias likely from extraneous variables, due to greater difficulty of controlling all aspects of experiment outside the laboratory.
可能會有來自額外變量的更多的偏差，因爲在實騐室外控制實騐的所有方麪有很大睏難。
Wary of these possible criticisms, Rule and Ambady conducted a second experiment that controlled for such extraneous variables as self-presentation and hairstyle.
処於對這些批評的謹慎， Rule 和 Ambady實施了第二次實騐以控制外部變量，例如自我表現和發型。