Consider a normal population distribution with the value of a known. (a) What is the confidence level for the interval x ± 2.880/√n? (Round your answer to one decimal place.) 99.6 USE SALT (b) What is the confidence level for the interval x ± 1.410/√n? (Round your answer to one decimal place.) 86.4 X % (c) What value of z

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Consider a normal population distribution with the value of σ known.
(a) What is the confidence level for the interval x ± 2.880/√n? (Round your answer to one decimal place.)
99.6
USE SALT
(b) What is the confidence level for the interval x ± 1.410/√n? (Round your answer to one decimal place.)
86.4
X %
(c) What value of Za/2
Za/2
(x-₂
= 2.97
%
in the CI formula below results in a confidence level of 99.7%? (Round your answer to two decimal places.)
VA)
a/2 √n
(d) Answer the question posed in part (c) for a confidence level of 66%. (Round your answer to two decimal places.)
Za/2=0.95
Transcribed Image Text:Consider a normal population distribution with the value of σ known. (a) What is the confidence level for the interval x ± 2.880/√n? (Round your answer to one decimal place.) 99.6 USE SALT (b) What is the confidence level for the interval x ± 1.410/√n? (Round your answer to one decimal place.) 86.4 X % (c) What value of Za/2 Za/2 (x-₂ = 2.97 % in the CI formula below results in a confidence level of 99.7%? (Round your answer to two decimal places.) VA) a/2 √n (d) Answer the question posed in part (c) for a confidence level of 66%. (Round your answer to two decimal places.) Za/2=0.95
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