Good wood? A lab supply company sells pieces of Douglas fir 4 inches long and 1.5 inches

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Good wood? A lab supply company sells pieces of Douglas fir 4 inches long and 1.5 inches square for force experiments in science classes.

From experience, the strength of these pieces of wood follows a Normal distribution with standard deviation 3000 pounds. You want to estimate the mean load needed to pull apart these pieces of wood to within 1000 pounds with 95% confidence.

How large a sample is needed? Show your work.

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The Practice Of Statistics

ISBN: 9781464108730

5th Edition

Authors: Daren S. Starnes, Josh Tabor

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Question Posted: Jul 19, 2024 04:04 PM

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Good wood? A lab supply company sells pieces of Douglas fir 4 inches long and 1.5 inches

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The Practice Of Statistics

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