(Step-by-Step) All packages received by Federal Express have a standard deviation of 1.9kg (σ). If a sample of 45 packages are randomly selected and the
Question: All packages received by Federal Express have a standard deviation of 1.9kg ( \(\sigma \) ).
If a sample of 45 packages are randomly selected and the sample average weight of these packages is 15.3kg, construct a 96% confidence interval estimate for the true mean weight of all packages received by the Federal Express.
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