Question: (a) Why does the size of the CI become larger when we change from a 95% CI to a 99% CI? (b) We can be

(a) Why does the size of the CI become larger when we change from a 95% CI to a 99% CI?

(b) We can be more certain that the unknown population mean falls within the 99% CI than within the 95% CI. Why, then, don't we always use 99% CIs?

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