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 lower 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 lower confidence limit for an 80% CI can be calculated using the formula: mean - (Z * standard error), where Z is the Z-score corresponding to the desired confidence level. For an 80% CI, the Z-score is approximately 1.28. Thus, the calculation is 8.8 - (1.28 * 1.8) = 8.8 - 2.304 = 6.496, which rounds to 6.4.

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