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Researchers want to test the effectiveness of a new anti-anxiety medication. Two hundred eighty patients were...

Researchers want to test the effectiveness of a new anti-anxiety medication. Two hundred eighty patients were recruited to participate in the clinical trial. In clinical testing, 120 out of 180 people taking the medication reported symptoms of anxiety. Of the other 100 people receiving a placebo, 70 reported symptoms of anxiety. What is the estimated standard error of the difference of the two sample proportions based on pooled sample proportion?

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