What is the positive critical value of Z to test this two-tailed hypothesis at ?=.01? What is the value of Z r1 and Z r2? What is the observed value of Z r1 -r2 ? Build a 99% confidence interval around each group's correlation; 99% Cl for r1 = (____ - _____) 99% Cl for r2 = (____ - _____) ?Write up these results.

D Imagine you are in charge of making curriculum decisions for your local school district. You have tested out two different early intervention programs to help kids with reading delays. 100 children participated in each program, and in both groups there was quite a wide range in how many hours children were working with the program materials. You have data on X: how many hours a child worked with the given program materials, and Y: the child's score on a grade-level reading test at the end of the year. You calculate the correlations between hours of exposure and reading score separately for the 2 groups that each received a different intervention program: Group 1: r=0.80, n=100 Group 2: r=0.50, n=100 You want to find out if there is a significant difference between the effectiveness of the two programs