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The principal randomly selected six students to take an aptitude test

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The principal randomly selected six students to take an aptitude test. Their scores were: 73.4 79.0 87.1 71.6 74.7 85.9 Determine a 90% confidence interval for the mean score for all students. a)73.10 < ? < 84.14 b)73.20 < ? < 84.04 c)84.04 < ? < 73.20 d)84.14 < ? < 73.10