PSYC 2520 Chapter Notes - Chapter 7: Factorial Experiment, Random Assignment, Latin Square
26 Oct 2016
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The term focused to describe statistical procedures that ask precise questions of data. Focused statistical tests include (a) all t tests, (b) only f tests with 1 degree of freedom in the numerator, and (c) only chi-square tests with 1 degree of freedom. The identifying characteristic of randomized experiments is that the allocation of sampling units to groups or conditions is done by a process of random assignment or randomization. There are three principal reasons why random assignment is used: (cid:1004)(cid:1005). It is i(cid:374)te(cid:374)ded to pro(cid:448)ide a safeguard agai(cid:374)st the possi(cid:271)ilit(cid:455) of the resear(cid:272)hers" subconsciously letting their opinions or preferences influence which sampling units will receive a given treatment: 02. It distributes the characteristics of the sampling units over the experimental and control conditions in a way that should not bias the outcome of the experiment: 03. It permits the computation of statistics that require particular characteristics of the data.
