A marketing researcher conducted a multiple regression analysis to explain how much customers spend on a company’s products (Amount Spent) as a function of four customer characteristics/variables: annual salary (Salary), number of children (Children), age (Age), and location (Location; rural or urban). Use the two partial ANOVA tables from regression analysis below to determine how much additional variation (as a percentage) in Amount Spent can be explained by Salary and Children, together, over-and-above Age and Location: MODEL 1: Amount Spent = f(Age, Location)
SSE = 37,200 MSR = 11,600
MODEL 2: Amount Spent = f(Age, Location, Salary, Children)
SSE = 13,800 MSR = 11,650

a. 62.90%
b. 38.74%
c. 26.96%
d. 58.97%

I've been working on this for a few days and i just don't understand, it's due in a few hours. you. the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α. part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part b suppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case. part c now try a numerical problem. what is the direction of the vector w = < -1, 6 > ?