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What does it mean to have multiple independent variables?
But including multiple independent variables also allows the researcher to answer questions about whether the effect of one independent variable depends on the level of another. This is referred to as an interaction between the independent variables.
When do you use non-independent multiple comparisons?
Another experimental design with multiple, non-independent comparisons is when you compare multiple variables between groups, and the variables are correlated with each other within groups.
Are there any studies that include multiple dependent variables?
Sketch and interpret bar graphs and line graphs showing the results of studies with simple factorial designs. Just as it is common for studies in psychology to include multiple dependent variables, it is also common for them to include multiple independent variables.
Why are there so many independent variables in an experiment?
The Effects of Reduced Food Size and Package Size on the Consumption Behaviour of Restrained and Unrestrained Eaters Just as including multiple dependent variables in the same experiment allows one to answer more research questions, so too does including multiple independent variables in the same experiment.
How are independent variables manipulated in a factorial design?
In a between-subjects factorial design, all of the independent variables are manipulated between subjects. For example, all participants could be tested either while using a cell phone or while not using a cell phone and either during the day or during the night.
Where does the minimum of a function of two variables occur?
The minimum of a function of two variables must occur at a point (x, y) such that each partial derivative (with respect to x, and with respect to y) is zero. (Of course there are other possibilities akin to those in calculus of one variable — if the derivative is not defined, etc. They don’t apply here.)