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
Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o
Cystoscopy. In this procedure, a specialized endoscope with a rigid tube, known as a cystoscope, is
Internal structures of the eye.
The internal and external anatomy of the kidney.
Measles rash. (© Lowell Georgia/Science Source/Photo Researchers, Inc.)
bird internal