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TREATMENT DATA: 100, 120, 140, 95, 98, 115 Assuming untreated group has mean = 100, std.dev...

TREATMENT DATA: 100, 120, 140, 95, 98, 115

Assuming untreated group has mean = 100, std.dev = 15 in the sampling distribution, should you reject or fail to reject the null hypothesis (p<0.05)?  What is the effect size (Cohen’s d)?

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Answer #1

Yes, we would reject the null hypothesis since P value is less than 0.05

Cohen’s d = 100/15

= 6.67

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