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.