Complete the Quantitative Research Methods Matrix according to the following guidelines:

List the primary characteristics of each design
Locate a current peer-reviewed article (within the past 5 years) in your field that demonstrates each quantitative research method
Explain the following for each article:
The problem investigated
How the sample was selected
How variables were defined and measured
How data were collected and analyzed
The key findings
The generalizability of the findings
Format your matrix consistent with APA guidelines.