15. Before and after experiments, those that nse the same subjects for pre-testing and post-testing a treatment, use what type of design?
A. Double-blind design
B. Blocking with control design
C Completely randomized design
D. Blocking without control design
· E. Matched pair design

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

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.

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.