An article in the British Medical Journal [Comparison of Treatment of Renal Calculi by Operative Surgery, Percutaneous
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An article in the British Medical Journal [“Comparison of Treatment of Renal Calculi by Operative Surgery, Percutaneous Nephrolithotomy, and Extracorporeal Shock Wave Lithotripsy” (1986, Vol. 292, pp. 879–882)] reported that percutaneous nephrolithotomy (PN) had a success rate in removing kidney stones of 289 out of 350 (83%) patients. However, when the stone diameter was considered, the results looked different. For stones of <2cm, 87% (234/270) of cases were successful. For stones of ≥2cm, a success rate of 69% (55/80) was observed for PN.
(a) Are the successes and size of stones independent? Use α = 0.05.
(b) Find the P-value for this test.
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Related Book For
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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