Question: Suppose x has a normal distribution with = 1.2. (a) Find the minimal sample size required so that for a 90% confidence interval, the

Suppose x has a normal with σ = 1.2.
(a) Find the minimal sample size required so that for a 90% confidence interval, the maximal margin of error is E = 0.5.
(b) Based on this sample size and the x can we assume that the is approximately normal? Explain.

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