Suppose that there are two types of tickets to a show: advance and same - day. The combined cost of one advance ticket and one same - day ticket is $ 60. For one performance, 20 advance tickets and 25 same - day tickets were sold. The total amount paid for the tickets was $ 1400. What was the price of each kind of ticket?

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.