Sherry Winters was directed to weigh a 50 g mass on the balance. After diligently goofing off for ten minutes, she quickly weighed the object and reported 42 g.
Determine the percent error involved in this situation.
16.0%
8.0%
1.9%
19.0%

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 .