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
Bronchoscopy. Figure illustrates physician using a bronchoscope to inspect the patient’s bronchial t
External and internal structures of nails.
A, External respiration; B, internal respiration.
Internal structures at the front of the eye.
Aneurysms: (A) saccular (Simon Fraser/RNC, Newcastle/Photo Researchers, Inc.); (B) fusiform.