(4) The researcher in exercise2 decides to conduct the same study using a within

(4) The researcher in exercise2 decides to conduct the same study using a within-participantsdesign tocontrol for differences in cognitive ability.He selects a random sample of subjects and has them studydifferentmaterial of equal difficulty in both the music and no-musicconditions. The study is completely counterbalanced tocontrol for order effects. The dataappear next. As before they aremeasured on an interval-ration scale and are normally distributed;he believesthat studying under quiet conditions will lead to betterperformance.