A company produces precision 1000‑millimeter rulers. The actual distribution of the lengths of the rulers produced by this company is Normal, with mean ?μ and standard deviation ?=0.02 millimeters. Suppose I select a simple random sample of four of the rulers produced by the company and I measure their lengths in millimeters. The sample yields ?¯=1000 . A 90% confidence interval for ?μ is: 1000±0.0196 1000±0.0115 1000±0.0165 1000±0.0082

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