Professor grant is interested in studying the development of a sense of humor. she collects data from groups of 6-year-olds, 16-year-olds, 26-year-olds, and 46-year-olds. what type of research design is professor grant using?
a. cross-sectional
b. longitudinal
c. double-blind
d. behavior genetics

a. Cross-sectional design

Explanation:

Cross-sectional design -

It is the type of research design , where the study require data from all the fields of interest , for analysis , is known as cross - sectional design.

In this type of method , every bit and piece of information is gathered from the research topic and then analysed , in order to have a proper and brief knowledge of the topic.

Hence, from the question,

The research method adapted by the professor Grant is the Cross-sectional design.

the answer is:

c. economic output

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.