A dietician is interested in comparing the
effectiveness of a certain food ingredient T2
(Treatment) with a standard food ingredient T1(control)
in modulating body weight among subjects. She
collected a random sample of 60 volunteer subjects.
She matched these volunteers each with a single
control of the same gender and comparable age. After
measuring their initial body weights she then randomly
assigned one member of each of the resulting 30
paired samples of subjects to the experimental
treatment T2 and the remaining member of the pair to
the standard treatment or control T1. After the
experimental period, she again measured the body
weight of each member of the paired samples and
thereafter determined the gain(+) or loss(–) in body
weight of each member obtaining the following results
(Table 2)