Question: (a) What is the difference between the independent variable and the dependent variable in an experiment? (b) When the assumptions of a procedure require normally

(a) What is the difference between the independent variable and the dependent variable in an experiment?
(b) When the assumptions of a procedure require normally distributed interval/ratio scores, are we referring to scores on the independent or dependent variable?
(c) What distinguishes an interval and ratio variable from nominal or ordinal variables?
(d) What distinguishes a skewed versus a normal distribution?

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