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The yield point of a particular type of steel-reinforcing bar is known to be normally distributed with an unknown and = 100. Tests were conducted

The yield point of a particular type of steel-reinforcing bar is known to be normally distributed with an unknown and = 100. Tests were conducted on a random sample of 64 bars, resulting in a sample average yield point of 8,000 lbs. Compute a 95% confidence interval for , the true average yield point of the bars.

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