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7) A doctor claims that more than 20% of the patients that he performs a knee replacement surgery on do not return to work in

7) A doctor claims that more than 20% of the patients that he performs a knee replacement surgery on do not return to work in the first 3 months after the operation. A sample of 50 patients that had a knee replaced by the doctor showed that 15 of them did not return to work within 3 months of the surgery. Test the doctor's claim at the 0.05 level of significance

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