Indira finds that on a typical day, 4 out of every 5 students at her school eat a cafeteria lunch. The rest of the students bring their lunch from home. Indira’s school has 495 students. On a typical day, how many students at her school bring their lunch from home?

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.