Consider a normal population distribution with the value of a known. USE SALT (a) What is the confidence level for the interval x ± 2.880/√n? (Round your answer to one decimal place.) % (b) What is the confidence level for the interval x ± 1.450/√n? (Round your answer to one decimal place.) % (c) What value of z in the CI formula below results in a confidence level of 99.7%? (Round your answer to two decimal places.) a/2 O - Zal x + Za/2 FF) n Za/2 (d) Answer the question posed in part (c) for a confidence level of 62%. (Round your answer to two decimal places.) Za/2

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