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Find the width of the 95% confidence interval for mean.
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ^{2} = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
(1) 0.269
(2) 0.538
(3) 6.3208
(4) 0.0116
(5) 0.0233
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