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The lengths, in inches for a particular population of sockeye salmon ( Oncorhynchus nerka ) are known to be normally distributed with variance 2=25.1. A

The lengths, in inches for a particular population of sockeye salmon (Oncorhynchus nerka) are known to be normally distributed with variance 2=25.1. A random sample of 12 sockeye salmon were pulled from the region and measured, producing a sample mean of x=23.7 inches.

Derive an 80% confidence interval for the true population mean length

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