Kathryn wants to control for intelligence in her study. She has a list of all of the participants for her study and their IQ scores. She sorts the list of participants according to their IQ scores and then forms groups making sure that the groups are balanced in terms of IQ scores. Finally, she randomly assigns each group to one of the conditions of her study. What kind of design is Kathryn using?

a. independent groups
b. concurrent measures
c. matched-groups
d. within-groups

matched-groups

Explanation:

The Matched group design also known as matched subjects design refers to design which is applied in experimental research. In this type of design, the different experimental conditions are observed while the individual difference are controlled by matching similar subjects or groups with each other.

The correct answer is c. matched-groups

Explanation:

The kind of design Kathryn is using is matched groups.

Matched groups design refers to a technique in research design in which a participant in an experimental group being exposed to a manipulation is compared on an outcome variable to a specific participant in the control group who is similar in some important way but did not receive the manipulation for instance Kathryn wants to control for intelligence in her study, She has a list of all of the participants for her study and their IQ scores, She sorts the list of participants according to their IQ scores and then forms groups making sure that the groups are balanced in terms of IQ scores, Finally, she randomly assigns each group to one of the conditions of her study.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.