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
Stromatolite fossil cut away to reveal the internal concentric banding.
Hong Kong is a strange situation. A British colony since 1842, it was handed back to China in 1997 a
Researchers have found that science instruction can be quite effective in grades 4 to 7.
Examples of internal controls.
Internal Anatomy of the Stomach
Internal Renal Anatomy