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A researcher is studying the average change in heart rate (in beats per minute) after jump scares in horror movies. They want to know if

A researcher is studying the average change in heart rate (in beats per minute) after jump scares in horror movies. They want to know if the heart rate changes at all. The data points are: 0, -2.5, 7.75, 9, -2, 0, and 8. What is the Cohen's d effect size

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