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the test scores of 12 randomly selected students in a class are 85, 79, 84, 94,...

the test scores of 12 randomly selected students in a class are 85, 79, 84, 94, 96, 78, 88, 91, 76, 99, 95, and 81. Assume the scores follow a normal distribution, calculate 90% confidence interval for the standard deviation of the scores for the class. (sample variance = 60.88)

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