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A teacher administers a test to his class of 30 students. The mean score (out...

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Basic Math

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A teacher administers a test to his class of 30 students. The mean score (out of 100 possible points) is 80. From previous studies, you know the population standard deviation is 6. Using the sample data given, calculate a 90% confidence interval for the population mean.(A) 75 - 78(B) 77 - 83(C) 78 - 82(D) 75 - 85

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