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A random survey of 75 long term marathon runners revealed that the mean length of time they had been running is 17.4 years with standard

A random survey of 75 long term marathon runners revealed that the mean length of time they had been running is 17.4 years with standard deviation of 6.3 years Conduct a hypothesis test to determine if the population mean time is likely to be greater than 15 years Null hypothesis? Alternative hypothesis? Test static? P-value ? Conclusion? Interpretation

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