Consider a normal population distribution with the value of known. (a) what is t

Question

Consider a normal population distribution with the value of known. (a) what is the confidence level for the interval 2.88o/Vn? (Round your answer to one decimal place.) (b) What is the confidence level for the interval 1.45o/vn? (Round your answer to one decimal place (c) What value of Za/2 in the CI formula below results in a confidence level of 99.7%? (Round your answer to two decimal places.) Zu/2 = (d) Answer the question posed in part (c) for a confidence level of 75%. (Round your answer to two decimal places.)

Explanation / Answer

A) Zalpha/2 = 2.88

Or, alpha / 2 = 0.002

Or, alpha = 0.004

Confidence level = 99.6%

B) Zalpha/2 = 1.45

Or, alpha/2 = 0.0735

Or, alpha = 0.147

Confidence level = 85.3%

C) alpha = 1 - 0.997 = 0.003

Zalpha/2 = Z0.0015 = 2.96

D) alpha = 1 - 0.75 = 0.25

Zalpha/2 = Z0.125 = 1.15

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