Both effect size and the value of the test statistic are unaffected by changes in the sample size (holding other factors constant).

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Quizplus · Accepted Answer

Effect size is generally unaffected by sample size as it measures the strength of a relationship or the magnitude of a difference independent of sample size. However, the value of the test statistic is affected by changes in the sample size, with larger sample sizes often leading to larger test statistics, assuming the effect size remains constant, because the standard error (which is in the denominator of most test statistic formulas) decreases as sample size increases.

Both Effect Size and the Value of the Test Statistic