A random sample of the SAT-M scores of 100 students, the mean was 504.5 and standard deviation 100. A random sample of the SAT-M scores of 30 students who too the test for the seond time this year was also obtained. Mean of these 30 scores was 539.1 while the standard deviation was 90. A 95% confidence interval for Mu2-Mu 1 is approximately?

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