In a sample of 18 participants, a researcher estimates the 80% CI for a sample with a mean of M1 – M2 = 8.8 and an estimated standard error for the difference (SM1 – M2) of 1.8. What is the upper confidence limit for this interval?
A. 6.4
B. 7.0
C. 10.6
D. 11.2
Ans: D
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