A researcher asks a sample of brothers and sisters to rate how positive their family environment was during childhood. In this study, the differences in ratings between each brother and sister pair were compared. The type of design described here is called a. A)repeated measures designB)matched samples designC)both A and B

b). matched-samples design

Explanation:

Matched-samples design  is the design in which matching mechanism in used  samples. Participants share matched samples every characteristic expect for the trait that is being researched or experimented.

According to the question, matched pair of brother and sisters are involved in research for describing positivity rate in family in childhood.Thus, they have matched characteristics for finding positivity rate.

Other options are incorrect because repeated measure and both the measures together are not depicted through design in case.Thus, the correct option is option(b).

answer; (true);