Question

An article in Knee Surgery, Sports Traumatology, Arthroscopy ["Arthroscopic Meniscal Repair with an Absorbable Screw: Results and Surgical Technique" (2005, Vol. 13, pp. 273-279)] showed that only 25 out of 37 tears (67.6%) located between 3 and 6 mm from the meniscus rim were healed. Compute a 95% two-sided Agresti-Coull Cl on the proportion of tears that will heal. Round your answers to two decimal places (e.g. 98.76). PO sps

Answer 1

Here we have: n= 37 x= 25 Sample proportion: 25 > X =-=-= n 37 = 0.676 a = 1-0.95 = 0.05 (95% confidence level) Critical value: Zcrit= za 2 = 20.05/2 = +1.96 Confidence interval: (1-0) P= P +2c* n

= 0.676 + 1.96* 0.676(1-0.676) 37 = 0.676 + 0.151 = 0.53<P<0.83