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Serenity tests if playing with a stress ball reduces people's stress levels. She measures stress levels before and after people play with a stress ball
Serenity tests if playing with a stress ball reduces people's stress levels. She measures stress levels before and after people play with a stress ball and conducts a related samples t test. The mean difference in stress level (after - before) is -1.1 and the standard deviation of the difference is 2.75. What is the effect size Cohen's d
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