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 (S_M1_-_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

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Quizplus · Accepted Answer

The upper confidence limit is calculated as the mean difference plus the margin of error. The margin of error is the product of the critical value (z-score for 80% CI is approximately 1.28) and the standard error. Thus, 8.8 + (1.28 * 1.8) = 11.2.

In a Sample of 18 Participants,a Researcher Estimates the 80