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Find the three intervals with 90%, 95%, or 99% confidence level for the mean training time. Compare with estimates assuming σ = S. [4] The lengths of steel pipes produced by BEST Steel Inc. Are normally distributed with standard deviation 1. 8 mm? How large a sample is needed to find the 99% confidence interval for the pipe length with margin of error 0. 50 mm?
Sagot :
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