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 (S_M1_-_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.

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Quizplus · Accepted Answer

The 95% confidence interval is calculated as the mean difference ± (critical value * standard error). For a 95% CI, the critical value is approximately 1.96. Thus, 0.7 ± (1.96 * 0.2) gives the interval 0.3 to 1.1.

In a Sample of 30 Participants,a Researcher Estimates the 95