A Researcher Plans to Use a Matched Groups Design to Assess

A researcher plans to use a matched groups design to assess a treatment for increasing body weight of premature infants.The independent variable has two conditions,treatment and control.Eight pairs of premature infants are matched according to their body weight prior to manipulating the independent variable.In order to control for other potentially relevant characteristics of the participants,the researcher should

A) identify a matching variable uncorrelated with body weight.
B) assign the lower weight infant in each pair to the treatment condition.
C) randomly assign infants in each pair to the treatment or control group.
D) none of these