In a regression analysis involving observations, the following estimated regression equation was obtained. Enter negative values as negative numbers. ŷ= 17.6 + 3.8x1 - 2.3x2 + 7.6 x3 + 2.7x4

Interpret b1,b2,b3 and b4 in this estimated regression equation. Assume that for each coefficient statement, the remaining three variables are held constant (to 1 decimal).

b1= estimated change in y per 1 unit change in xl
b2= estimated change in y per 1 unit change in x2
b3= estimated change in y per 1 unit change in x3
b4= estimated change in y per 1 unit change in x4

Required:
Predict y when x1 =10, x2= 5, x3 =1, and x4 =2 (to 1 decimal).

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 > ?