Hay 105 números escritos en una fila.
1, 2, 2, 3, 3, 3, 4, 4, 4, 4 y así sucesivamente (cada número n está escrito n veces) ¿cuántos de estos números son divisibles entre 3?

a)4 b)12 c)21 d)30 e)45

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.