Question: How heavy a load (in pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Suppose that

How heavy a load (in pounds) is needed to pull apart pieces

How heavy a load (in pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Suppose that the strength of pieces of wood follows a Normal distribution with standard deviation 3000 pounds. You want to estimate the mean load needed to pull apart the pieces of wood to within 1600 pounds with 95% confidence. How large a sample n is needed? Give your answer rounded up to the nearest whole number. n = 96 Incorrect

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