The independent variable is the temperature.
The study aims to assess how the temperature level affects another variable, that, in turn, will be the dependent variable: the mood of the participants. The aim of the study is to conclude whether it is possible or not to infer causality between those two, in other words, to see whether different levels of temperature (<em>the cause</em>), trigger the emergence of a certain type of mood <em>(the effect).</em>
I believe the answer is: Referent power
Referent power refers to the type of power that can be used to influence an outcome through the interpersonal relationship that an individual has with another. In order for a person to have a referent power, he/she must be genuinely liked or respected by the other person.
