In an effort to produce a formula for estimating the age of large free standing oak trees non-invasively, the girth :1: (in inches) five feet off the ground of 15 such trees of known age y (in years) was measured. The sample data are summarized by the following information. 11. = 15 2:1: = 3368 2y = 6496 23y = 1,933,219 22:2 = 917,730 Eyz = 4,260,666 74 3 :1: S 395 Compute the least squares regression line. Interpret the value of the slope of the least squares regression line in the context of the problem. Estimate the age of an oak tree whose girth ve feet off the ground is 92 inches