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QUESTION
A random sample of 20 students obtained a mean of x = 72 and a variance of s2 = 16 on a college placement test in mathematics.
72. A random sample of 20 students obtained a mean of x = 72 and a variance of s2 = 16 on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% confidence interval for sigma^2.
