In a sample of 30 participants, a researcher estimates the 95% CI for a sample with a mean of M1 – M2 = 0.7 and an estimated standard error for the difference (SM1 – M2) of 0.2. What is the confidence interval at this level of confidence?
A. 95% CI 0.4, 1.0
B. 95% CI 0.5, 0.9
C. 95% CI 0.3, 1.1
D. There is not enough information to answer this question.
Ans: C
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