Determine the empirical formula of a sample that has 34.6% aluminum, 61.5% oxygen, and 3.85% hydrogen

Because a model would make the investigation easier to understand

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .