Dobby the house-elf has dropped all his socks on the floor in the middle of the night! he has 30 red socks, 22 gold socks and 14 black socks. how many socks would he have to pick up before getting a matching pair?

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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.

Through non-collinear points there is exactly one plane.