What according to Lenin was the cause of World War I?

The Solomon three-control-group research design helps to eliminate which of the following?

a.) the test effect b.) any stimulus c.) external factors d.) sample error

Most political scientists, like scientists in other disciplines, accept ______________, in which it is not necessary to explain or predict a phenomenon with 100% accuracy.

a. Approximate explanation b. Nonapproximate explanation c. Probabilistic explanation d. Nonprobabilistic explanation