One mole of an ideal gas is held at standard conditions. at what kelvin temperature would the pressure be doubled?

The volume should be kept in constant condition.
Then we go 
and if P2 is equal to 2P1, we have 
which means that needed temperature is half of the initial temperature

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 .