How do I calculate Cohen's d?
An example of an AI chatbot conversation about calculating Cohen's d for effect size.
How do I calculate Cohen's d?
Cohen's d is a measure of effect size that indicates the standardized difference between two means. Would you like to know the formula?
Yes, please provide the formula.
The formula for Cohen's d is: d = (M1 - M2) / SDpooled, where M1 and M2 are the means of the two groups, and SDpooled is the pooled standard deviation.
How do I calculate the pooled standard deviation?
To calculate the pooled standard deviation, use the formula: SDpooled = sqrt(((n1-1) * SD1^2 + (n2-1) * SD2^2) / (n1 + n2 - 2)), where n1 and n2 are the sample sizes and SD1 and SD2 are the standard deviations of the two groups.
Can you give me an example with numbers?
Sure! If Group 1 has a mean of 50, SD of 10, and n1 = 30, and Group 2 has a mean of 40, SD of 15, and n2 = 30, we can calculate Cohen's d using the provided formulas.
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