Because researchers are generally more concerned with establishing internal validity rather than external validity, they are typically more concerned with _________ and less concerned with ____________.
a. random selection; random assignment
b. random assignment; random selection
c. populations; samples
d. samples; populations
Question 2
In a(n) design, the experimenter takes multiple measures on the dependent variable both before and after treatment.
a. non-equivalent control group
b. interrupted time series
c. multivariate
d. before-after
External and internal structures of nails.
Internal view of the heart with aorta, vena cava, and pulmonary arteries and veins.
Ascaris. (Sinclair Stammers/Science Photo Library/Photo Researchers, Inc.)
Internal organs of the female reproductive system within the pelvis
Establishing rapport with his older adult
The body’s survival depends on mechanisms that maintain internal homeostasis