PSY 555 Homework 15

Chapter 9: #9,12,17,23,24,25

1. Please describe the effects of range restrictions and heterogeneous subsamples.

2. A study found a correlation of r=.53 between two variables. Another researcher found a correlation of r=.42. I am interested in comparing these two correlations.

a. Please state the null and alternative hypotheses.

b. Given that a z of 2.5 was found, please interpret the results using a significance level of .05.