Final answer:
A Cohen's d value of 0.5 would be viewed as indicative of a medium effect size.
Step-by-step explanation:
Cohen's d is a measure of effect size based on the differences between two means. Cohen's d, named for U.S. statistician Jacob Cohen, measures the relative strength of the differences between the means of two populations based on sample data. A Cohen's d value of 0.5 would be viewed as indicative of a medium effect size. This means that the size of the differences between the means is moderate, indicating a noticeable difference between the two groups being compared.