The difference of the sample means of two populations is 34.6, and the standard deviation of the difference of the sample means is 11.9. The 95% confidence interval lies between A) - 11.9 B) - 23.8 C) - 35.7 D) - 45.4 and A) 11.9 B) 23.8 C) 35.7 D) 45.4
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