Question: Please explain throughly as id like to understand. Thank you! As is the case for other professions which require dexterity and athleticism, the career span

Please explain throughly as id like to understand. Thank you!

As is the case for other professions which require dexterity and athleticism, the career span of a professional dancer is relatively short. A random sample of 16 retired professional dancers is collected. The average length of their dancing careers was 14.7 years with a standard deviation of 5.6 years. Find a 90% confidence interval for the mean length of a dancing career. You may assume the variable is normally distributed

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