Choose all of the equations that represent a parabola with the focus (0,4) and the vertex (0-6). A = 20 (y + 1)

B. = 40 (y +6)

c. 20y = 2 – 20

D. 40y = (x + 62

E. 40y = - 240

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.