Abstract

In Chapter 4.1 experiment, quasi-experiment and non-experimental investigation approach are compared, specific subjects concerning experiment and quasi-experiment are dealt with in Chapters 4.1.1 and 4.1.2. In Chapter 4.2 the central importance of random assignment to control confounding variables within an experiment is discussed. Random allocation for permutation tests in context with defining H0 is explained in Chapter 4.3. In Chapters 4.4 and 4.5 it is attempted to justify the application of permutation tests in quasi-experimental designs and non-experimental research. Finally (Chap. 4.6), permutation tests and AP methods are compared with regard to the types of investigation as the most important differences are highlighted.

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