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The time it takes broken bones of a given size and type to heal is normally...

The time it takes broken bones of a given size and type to heal is normally distributed. A random sample of 17 simple arm breaks occurring in people in their twenties took an average of 50 days to heal with a standard deviation of 5 days.
A) Find a 95% confidence interval for the healing time for all broken bones of this type

B) Find a 95% confidence interval for the population variance and standard deviation

Math   Statistics-And-Probability   
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