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Consider the one-sided confidence interval expressions for a mean of a normal population. What value of z would result on 98% Confidence Interval (CI)? What

Consider the one-sided confidence interval expressions for a mean of a normal population.

What value of z would result on 98% Confidence Interval (CI)?
What values of z would result on 95% CI?
What values of z would result on 90% CI?

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