Abstract:
The aim of the current research is to get acquainted with the reality of using
the “T” test and the one-Way ANOVA test as inferential parametric statistical
tests considering the concepts of test power and the effect size of according to
the sample size.
The sample of research published in the Journal of Psychological and
Educational Research issued by the Bahrain University in the period from
2008 to 2018, in which the “T” test and the one-way ANOVA were used,
which reached 94 research.
The research concluded in some of its results that the power of the
statistical test increases with the increase of the sample size, while the effect
size does not differ according to the sample size, and that the effect sizes
were weak and very weak, and the rate of the frst type error in this research
was approximately 21.4%, while the rate of the second type error contained
approximately 21.7%.