In a study of the long-term effects of promoting or hold
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In a study of the long-term effects of promoting or holding back elemenetary school students, the following reading test
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In a study of the long-term effects of promoting or holding back elemenetary school students, the following reading test results were obtained for a sample of 15 third grade studetns: Mean =31.0, s=10.5. Does this third grade sample mean differ significantly from first grade population mean of 41.9. Assume a 0.01 level of significance.
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