Acanadian study measuring depression level in teens (as reported in the journal of adolescence, vol. 25, 2002) randomly sampled 112 male teens and 101 female teens, and scored them on a common depression scale (higher score representing more depression). the researchers suspected that the mean depression score for male teens is higher than for female teens, and wanted to check whether data would support this hypothesis. if u1 and u2 represent the mean depression score for male teens and female teens respectively, which of the following is the appropriate pair of hypotheses in this case? a. h0: u1-u2=0ha: u1-u2< 0b. h0: u1-u2> 0ha: u1-u2=0c. h0: u1=u2ha: u1> u2d. h0: u1-u2=0ha: u1-u2> 0

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 > ?