Question: A random variable X is measured for a representative sample of individuals from a population. If the values of X are known to vary

A random variable X is measured for a representative sample of individuals

A random variable X is measured for a representative sample of individuals from a population. If the values of X are known to vary by a standard deviation of o= 15, what is the minimum sample size required to ensure a 95% confidence interval for the true mean has a margin of error of no more than 5?

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