In a sample of 20 participants, a researcher estimates the 99% CI for a sample with a mean of MD = 3.7 and an estimated standard error for the difference scores (SMD) of 0.2. What is the confidence interval at this level of confidence?
A. 99% CI 3.5, 3.9
B. 99% CI 3.2, 4.2
C. 99% CI 3.1, 4.3
D. There is not enough information to answer this question.
Ans: C
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