1. An experiment was designed to study of variables that affect productivity in the retail grocery trade. Data consists of the size x of a grocery outlet (thousands square feet) and the value added per work hour y. Use the method of least squares to find the linear regression equation of the form y = a + ax, correlation coefficient, and standard error for the following data. 6.4 11.2 y 8.1 11.5 18.6 23.3 16.7 18.2 35.5 22.4 24.6 37.2 39.1 41.9 27.5 28.7 (15 points)