This equation models the number of minutes, m, it takes dave and danica to wash the dishes. m m 18 20 about how many minutes will it take them to wash the dishes?
a. 9.5 minutes
b. 9 minutes
c. 8.5 minutes
d. 38 minutes
e. none of these

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.