Select one of the suggested references listed below. Based on your selection, complete the following tasks:

Identify and describe the research problem, purpose, objectives, and hypothesis identified in the article.
Describe how you would evaluate the credibility and validity of the study.
References:

Ko, E., Nelson-Becker, H., Park, Y., & Shin, M. (2013). End-of-Life decision making in older Korean adults: Concerns, preferences, and expectations.Educational Gerontology, 39(2), 71–81.

Roulston, A., Bickerstaff, D., Haynes, T., Rutherford, L., & Jones, L. (2012). A pilot study to evaluate an outpatient service for people with advanced lung cancer. International Journal of Palliative Nursing, 18(5),225–233.

Raurell-Torreda, M., Olivet-Pujol, J., Romero-Collado, A., MalagonAguilera, M. C., Patino-Maso, J., & Baltasar-Bague, A. (2015). Case-based learning and simulation: Useful tools to enhance nurses? education? Nonrandomized controlled trial. Journal of Nursing Scholarship, 47(1), 34-42.