Effect sizes are definitely important. Theory and Psychology Essay

Effect Size
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Effect Size
Effect sizes are definitely important, especially since they help in the interpretation of the result in cases where the sample size is large, and the value of p is likely to be less than .05 for an effect that is significantly small. Although this is essentially the case for results that are statistically significant, non-statistically significant findings, where the findings are greater than .05 are also expected to be accompanied by effect size. Effect size might be regarded as a true measure of significance because it quantifies the difference between the two groups. The effective size can also be regarded as the major finding of a quantitative study. The P value cannot reveal the size of effect even though it can inform the reader whether an effect exists. Therefore, I strongly believe that effect size should be included in a report as stated by Thompson (1999), and more so, it should be reported in both the abstract and the results section. Before conducting a research endeavor, a researcher should determine an estimate of the effect size to determine the number of participants who should take part in the study. Doing so might help the researcher to avoid type II error, which leads to the conclusion that no effect exists when there is one.
Power can be regarded as a function of effect size. In the case of conventional hypothesis testing, researchers draw their conclusions based solely on the value of P. This would mean that the value of P is meant to reject or support the null hypothesis. However, the P value only states the likelihood of th...