Because it can . . . [support]
cause-and-effect statements, . . . the experimental method
is the most powerful . . .
By
manipulating an independent variable (the
possible cause), the researcher . . . [can determine
with reasonable certainty] . . . . whether [or not] it influences
the dependent variable (the effect). Extracted
from Prentice-Hall Ch. 1 PP Slide Show for Davis & Palladino Text, Psychology, 4th
Edition. Dr. Vessels’ additions
are shown in brackets.
Experimental
Research