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To compare the treatment effects of two interventions, two independent samples of patient medical data were collected. The sample sizes are 20 and 22 respectively.

To compare the treatment effects of two interventions, two independent samples of patient medical data were collected. The sample sizes are 20 and 22 respectively. Assuming that the two populations shared the same variance, the researchers decided to conduct a two independent samples test for the means. What would be the number of degrees of freedom for the obtained t statistic with these sample sizes?

44

40

52

47

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