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5. What is a confidence interval? What factors affect their width? Why do we calculate them? Why not just report our estimate of the mean,

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5. What is a confidence interval? What factors affect their width? Why do we calculate them? Why not just report our estimate of the mean, or whatever population parameter we're interest in? How do we interpret confidence intervals? Why do we focus on population parameters when doing so? What, if any, inferences can we draw from confidence intervals calculated from convenience samples

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