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Hugo conducts an independent samples t test. The mean of the first sample is 13.8, the mean of the second sample 7.8, and the pooled

Hugo conducts an independent samples t test. The mean of the first sample is 13.8, the mean of the second sample 7.8, and the pooled variance is 9. What is the effect size? O -2 O -0.67 O 0.67 O 2

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