Measure the heights and weights of ten friends of the same sex.
a. Draw a scatterplot of the data, with weight on the vertical axis and height on the horizontal axis. Draw a line onto the scatterplot that you believe describes the average pattern. On the basis of two points on this line, estimate the slope of the relationship between weight and height.
b. Using statistical software, compute the least squares line, and compare the slope to your estimated slope from part (a).