If the null hypothesis states that $\mu$ = 70 and a researcher obtains a sample with M = 73 and s² = 9, then Cohen's d = 0.33.

Name: If the null hypothesis states that $\mu$ = 70 and a researcher obtains a sample with M = 73 and s 2 = 9, then Cohen's d = 0.33.
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Cohen's d is calculated as the difference between the sample mean and the population mean divided by the standard deviation, not the variance. Here, the standard deviation is 3 (since s^2 = 9), so Cohen's d = (73 - 70) / 3 = 1.

If the Null Hypothesis States That μ\muμ = 70 and a Researcher Obtains a Sample with M

If the Null Hypothesis States That $\mu$ = 70 and a Researcher Obtains a Sample with M