The average score for Indiana public school 6th graders on a standardized reading comprehension test is μ = 75, and the distribution is normally shaped. A principal of one school in northwest Indiana wants to know if a new reading program improves scores compared to the Indiana population mean. The principal takes a sample of 121 students and gives all of them the new reading program for one semester. After the semester is over, these 121 students are given a reading comprehension test. Their mean score is 75.9 with a standard deviation of 5. How large is the effect? O Small OSmall-Medium O Medium O Medium-Large Large

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