2. Swor et al. looked at the effectiveness of cardiopulmonary resuscitation (CPR) training in people over 55 years old. They compared the skill retention rates of subjects in this age group who completed a course in traditional CPR instruction with those who received chest- compression only cardiopulmonary resuscitation (CC-CPR). Independent groups were tested 3 months after training. The table below shows the skill retention numbers in regard to overall competence as assessed by video ratings done by two video evaluators. CPR CC-CPR Total Rated Overall Competent : Yes 12 15 27 : No 15 14 29 Total 27 29 56 Source: Robert Swor, Scott Compton, Fern Vining, Lynn Ososky Farr, Sue Kokko, Rebecca Pascual, and Raymond E. Jackson, "A Randomized Controlled Trial of Chest Compression Only CPR for Older Adults- a Pilot Study," Resuscitation, 58 (2003), 177-185. Find the following probabilities: KIM Question 2 continues on the next page