A simple random sample of 5k race times for 32 competitive female runners aged 15-24 years old resulted in a mean 5k race time of 16.79 minutes. The simple linear regression equation that fit the sample data was obtained and found to be y-predicted =21.506-0.276x , where,x represents the age of the runner in years and y-predicted represents the 5k race time for a competitive female runner in minutes. The proportion of variation in 5k race times that can be explained by the variation in the age of competitive female runners was approximately 0.663. What would be the value of the correlation coefficient?