Hi, ive come across a question in a stats book which asks the following: Q: A study was undertaken to find the relationship between "emotional stability" and performance in college. The following results were obtained: Emotional stability, Mean = 49, Standard Dev = 12 College Average, Mean = 1.35, Standard Dev = 0.5 pearson r = 0.5 n = 60 What proportion of total variation is accounted for by explained variation? As far as i was aware, i need to know the actual values in order to be able to calculate this (ie summation of (Yprime - Ymean)^2) but the above info is the only supplied information. Have i missed something? If so id appreciate it if someone could point it out. Thanks.