yes
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· Dependent variable ( student's academic achievement ) : It depend on the way that we use it to write the score (if we write it as a letter it will be an ordinal ,but if we write it as number it will be an interval). · Independent variable ( intelligent ) : Interval, · Independent variable ( attention ) : Interval,
Yes. Simply make sure that the interval is greater than or equal to the range of the random variable.
Yes, it is a Continuous variable measured along an equidistant scale.
subject variable
the variable age has discriptive value but not necessarily explanatory value.