Acupboard contains 55 pairs of shoes, each of a different style. how many ways are there to select 44 of the shoes from the cupboard so that the selection contains exactly one matching pair? note that each pair of shoes consists of a distinguishable left and right foot.

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.