An environmental scientist wishes to investigate the relationship between the size the drainage area for a river and the speed of the steamflow at a station further down the river. The scientist collects data on the drainage basin area (y; in square miles) and streamflow ( xi in cubic feet per second) for 32 rivers. The following table summaries the sample means and variances with the two variables and the sample covariance between them. Use these values to evaluate the least-squares estimates for the simple linear regression model. Give your answers to two decimal places. Statistic Value (mean) 18.98 y (mean) 73.23 s(variance) 638.94 s(variance) 5085.35 Sxy (covariance) 1616.55 Least-squares estimates: Intercept: to 2 d.p. Slope: = to 2 d.p.