The department of health studied the amount of reported hepatitis C cases in a country. The following data are the number of infected people y in the sample and their age x:y 15 317 559 574 495 294 145 43x 10 20 30 40 50 60 70 80 Required:a. Test for the significance of regression using the analysis of variance at α= 0.05. b. Find the test statistic. c. Find the critical value for the test statistic.

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 > ?