According to results from the Spine Patient Outcomes Research Trial, or SPORT, s

Question

According to results from the Spine Patient Outcomes Research Trial, or SPORT, surgery for a painful, common back condition resulted in significantly reduced back pain and better physical function than treatment with drugs and physical therapy (The Wall Street Journal, February 21, 2008). SPORT followed 803 patients, of whom 398 ended up getting surgery. After two years, of those who had surgery, 63% said they had a major improvement in their condition, compared with 29% among those who received nonsurgical treatment.

What is the probability that a patient had surgery? (Round your answer to 4 decimal places.)

What is the probability that a patient did not have surgery? (4 decimals)

What is the probability that a patient did not have surgery? (4 decimals)

Explanation / Answer

P( patients had surgery) = N(patient had surgery) / Total patients

= 398 / 803

= 0.4956

Probability that patient had surgery = 0.4956

Probability that patient did not have surgery = 1 - Probability that patient had surgery

= 1 - 0.4956

= 0.5044

Probability that patient did not have surgery = 0.5044

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