Question: Suppose x has a mound-shaped distribution with = 3. (a) Find the minimal sample size required so that for a 95% confidence interval, the

Suppose x has a mound-shaped with σ = 3.
(a) Find the minimal sample size required so that for a 95% confidence interval, the maximal margin of error is E = 0.4.
(b) Based on this sample size, can we assume that the is approximately normal? Explain.

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