Question: (a) Suppose we construct a 99% confidence interval. What are we 99% confident about? (b) Which of the confidence intervals is wider, 90% or 99%?

(a) Suppose we construct a 99% confidence interval. What are we 99% confident about?
(b) Which of the confidence intervals is wider, 90% or 99%?
(c) In computing a confidence interval, when do you use the t-distribution and when do you use z, with normal approximation?
(d) How does the sample size affect the width of a confidence interval?

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