1. How do we determine when a linear model is an appropriate model for a scatterplot?
2. When finding a linear model of a scatterplot of data, what makes the least squares regression line the “best” available linear model? What metrics do we have to measure the accuracy of the least squares regression line?
3. Suppose that a linear model is appropriate when comparing the height of children to age. The heights of 30 children, aged 5 to 9, are recorded. When do we expect this linear model to give reasonable approximations?