Question: 9.72 A random sample of 20 students yielded a mean of = 72 and a variance of s* = 16 for scores on a college

9.72 A random sample of 20 students yielded a mean of = 72 and a variance of s* = 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% con- fidence interval for o&gt

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