1. Recall that the least squares line minimizes the squares of the residuals. The plot to the right shows 5 data points and the least squares line. Sketch and shade the squares of the residuals. 2. For each research nding, decide whether there is evidence of causation, correlation or both. If it is only a correlation, name a possible lurking variable that may be the cause of the results. a. As the sales of television sets has increased, so has the number of overweight adults. Does television cause weight gain? A study in an elementary school found that children with larger shoe sizes were better readers than those with smaller shoe sizes. Do big feet make children read better? The more fireghters sent to a re, the longer it takes to put out the fire. Does sending more reghters cause a tire to burn longer