Answer to Question 1
Answer: External validity refers to the extent to which the results of an experiment can be generalized to other circumstances, such as other populations or places. Internal validity is the degree to which an experiment allows confident statements about cause and effect. Experimenters often are forced to make a trade-off between external and internal validity. The reason is that externally valid studiesthose that are most generalizable to the world outside the laboratorytend to be less controlled (and therefore have less internal validity) as a result. Conversely, experiments that have high internal validity often are so well controlled that they produce a very artificial environment, and therefore are more limited in the degree to which they generalize to the outside world.
Answer to Question 2
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The experimental approach used by Masui and Markert to identify cyclin and cyclin-dependent kinase (
A client is having an endoscopy performed by a physician who views the upper gastrointestinal intern
Evolutionary ecologists live and do research in contemporary cultures that maintain all or some aspe
A typical open-end wrench. Note the size difference on each end and that the head is angled 15 ...
Experimental demonstration of respiratory control
Research Methods