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For a sample of 11 independent observations from a normal distribution of unknown μ and unknown variance σ2, the sample mean is 74.6 and sample variance is 2.2. What is the lower point of the 90% confidence interval for μ?
(1) 73.1206
(2) 72.8469
(3) 73.7896
(4) 73.9863
(5) 73.1167
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