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On average, how much difference should there be between the sample mean and the population mean for a sample on n = 25 scores selected

On average, how much difference should there be between the sample mean and the population mean for a sample on n = 25 scores selected from a population with a standard deviation of o = 20? 1, cannot answer without additional information Oil. 2 points Olli. 4 points Orv. 0.80 points

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