Experiments with more than one independent variable

9 important questions on Experiments with more than one independent variable

What phrase is associated with a spreading interaction?

only when.

How do we call an independent variable that are selected, not manipulated in factorial design?

participant variables.

What does crossing two factors mean?

study each combination of the independent variables so AB, A-B, -AB, -A-B.
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Which three results will be inspected in a factorial research design?

- two main effects
- one interaction effect

How do we call the overall effect of one independent variable on the dependent variable, expressed as an average over the levels of the other independent variable, in a factorial design?

a main effect.

How can you check if there's an interaction from a table?

substract the numbers from both levels of of an independent variable, for the same levels of the other variable, so beide van boven naar onder, of van links naar rechts altijd lineair nooit gekruisd. and check if there's a significant difference between the difference of the two sets of numbers.

How can you check for interaction in a line graph?

if the lines are parallel there's no interaction.

How can you check for interaction from a table in an increased levels of the independent variables design? or for a three way design?

take the marginal mean from the independent variable for each level of the other independent variable and check for differences.

How do you check for a three way interaction?

if the two way interaction graphs differ from each other considered the third variable then the two way interaction graphs look different from each other on both levels of the third variable.

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