An article in Knee Surgery; Sports Traumatology Arthroscopy (2005, Vol. 13, pp. 273-279), considered arthroscopic meniscal repair with an absorbable screw. Results showed that for tears greater than 25 millimeters, 15 of 17 repairs were successful, while for shorter tears, 22 of 31 repairs were successful.
(a) Is there evidence that the success rate is greater for longer tears? Use 0.05. What is the P-value?
(b) Calculate one-sided 95% confidence bound on the difference proportions that can be used to answer the question in part (a).
(a) There is evidence that the success rate is greater for longer tears. The P-value is [P-value].
(b) The one-sided 95% confidence bound is [confidence bound].