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James is on the track team and runs a 100-meter dash several times each practice. A...

James is on the track team and runs a 100-meter dash several times each practice. A random sample of 20 times (in seconds) from those practices gives a sample mean of 11.395 with a standard deviation of 0.5021. What is a 95% confidence interval to estimate his true mean 100-meter dash time?

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