Consider a 90% confidence interval for μ. Assume σ is not known. For which sample size, n = 10 or n = 20, is the confidence interval longer? 10 20 neither
Added by John J.
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We know that the formula for a confidence interval when σ is not known is given by: CI = $\bar{x} \pm t_{\alpha/2} \cdot \frac{s}{\sqrt{n}}$ where $\bar{x}$ is the sample mean, $t_{\alpha/2}$ is the t-score for the desired level of confidence, $s$ is the sample Show more…
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