question archive 1 Consider a normal population distribution with the value ofσ known? a
1 Consider a normal population distribution with the value ofσ known? a
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1 Consider a normal population distribution with the value ofσ known?
a. What is the confidence level for the interval"X-bar"±2.81σ/√n?
b. What is the confidence level for the interval"X-bar"±1.44σ/√n?
c.What value of Zα/2 in the CI formula (7.5)results in a confidence level of 99.7%?
d. Answer the question posed in part (c) for a confidence level of75%?
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