99%; n = 12; is unknown; population appears to be normally distributed. Assume that we want
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99%; n = 12; σ is unknown; population appears to be normally distributed.
Assume that we want to construct a confidence interval using the given confidence level. Do one of the following, as appropriate: (a) Find the critical value zα/2, (b) find the critical value tα/2, (c) state that neither the normal nor the t distribution applies.
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