Dr. Dodd examines the relationship between senior citizens' performance on several cognitive tasks and their responses to a self-report measure of physical activity. However, the physical activity measure he uses was normed only on college students. Based on this information, the MOST apparent weakness of Dr. Dodd's study is the of the activity measure.

Standardization

Explanation:

Standardization  is defined as process in which something is kept and followed as per basic standards of that field.It maintains consistency level in the field for all the factors.

According to the question, standardization is the drawback factor in Dr. Dodd's research because the measure of physical activity was based on standards of college student's field .

This standard is used by Dr. Dodd for measuring senior citizen's physical activity. Thus, the result obtained will be inaccurate because of incorrect standardization used.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.