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The 95% confidence interval for the mean of a normal distribution is given by [4.519; 5.191]. The variance is unknown and the sample size is

The 95% confidence interval for the mean of a normal distribution is given by [4.519; 5.191]. The variance is unknown and the sample size is equal to 20. Find the value of the sample variance s 2 . (Hint: What is the length of the interval?)

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