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9. The average test score of entire school is 78. The random sample of 32 with standard deviation 9. The average test score of the

9. The average test score of entire school is 78. The random sample of 32 with standard deviation 9. The average test score of the sample is 84. Find the z-value. A. 3.771 B. 3.778 C. 3.877 D. 3. 678

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