Can you check out if my answers are right and tell me what is wrong.

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

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.

Two numbers have a sum of -19. one number is x. what expression represents the other number?