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8) (5 pts) Consider the population of speeds of trains on a high speed rail system. A sample of 64 trains gave a sample mean

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8) (5 pts) Consider the population of speeds of trains on a high speed rail system. A sample of 64 trains gave a sample mean speed of 160 mph. Assuming the population standard deviation o is known to be 10 mph, find the 98% confidence interval for the population mean speed, and state your conclusion

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