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A random sample of 11 items is drawn from a population whose standard deviation is unknown. The sample mean is x. Furthermore, x¯ = 920 and the sample standard deviation is s = 25. Use Appendix D to find the values of Student's t.
(a) Construct an interval estimate of μ with 95% confidence. (Round your answers to 3 decimal places.)
The 95% confidence interval is from _____to _____
(b) Construct an interval estimate of μ with 95% confidence, assuming that s = 50. (Round your answers to 3 decimal places.)
(c) Construct an interval estimate of μ with 95% confidence, assuming that s = 100. (Round your answers to 3 decimal places.)
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Estimate the population mean
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