A research team conducted a study of VARIABILITY in students' test performance. Researchers assu. that individual records are normally distributed with unknown mean and variance. They collectec sample of n = 25 test scores with summaries shown below. Sample Mean = X = 75.2 and Sample SD = S = 15 Estimate the POPULATION VARIANCE with confidence C = 0.99 • Show critical values needed • Evaluate the upper and lower confidence limits. UCL = LCL = Solution

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