A researcher estimates the 90% CI for a sample with a mean of M = 8.9 and a standard error (?M) of 2.1. What is the confidence interval at this level of confidence?
A. 90% CI 4.8, 13.0
B. 90% CI 5.5, 12.4
C. 90% CI 6.8, 11.0
D. There is not enough information to answer this question
Ans: B
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