You use an independent samples t statistic when a. The IV defines two independent samples and the DV is measured on an interval/ratio scale
b. The IV defines two matched samples and the DV is measured on an interval/ratio scale.
c. The IV defines one sample, the DV is measured on an interval/ratio scale, and the DV is measured twice on that same sample.
d. The IV defines one sample and the DV is measured on an interval/ratio scale and you do not know the population standard deviation.
e. The IV defines one sample and the DV is measured on an interval/ratio scale and you do know the population standard deviation

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 bsuppose 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 cnow try a numerical problem. what is the direction of the vector w = < -1, 6 > ?