Once a research hypothesis is formulated, the researcher must decide upon an appropriate study design to test that hypothesis. In doing so, she must take into consideration the extent to which that design will optimize the internal validity of her study findings (refer again the discussion of internal validity ). Also to be considered are the practical factors that may facilitate or inhibit implementation of particular study designs, e.g., limited access to one’s target population over time due to transiency among prospective research subjects may preclude adoption of a cohort study design.

Your Task for this Assignment

With the aforementioned factors in mind, identify a study design (experimental or observational) that would be appropriate to test your study’s research hypothesis, and address the following questions in a three-page essay:

What are the components of this design?
Would this design be considered experimental or observational? Why?
Why did you choose this design over others? Be sure to note all advantages and disadvantages of employing this design to address your particular research question.
To what types of bias is this design most vulnerable? Please explain.

SLP Assignment Expectations

You are expected to consult the scholarly literature in preparing your paper; you are also expected to incorporate relevant background readings.
Your paper should be written in your own words. This will enable me to assess your level of understanding.
In order to earn full credit, you must clearly show that you have read ALL required background materials.
Be sure to cite your references in the text of all papers and on the reference list at the end. For examples, look at the way the references are listed in the modules and on the background reading list.
Proofread your paper to be sure grammar and punctuation are correct and that each part of the assignment has been address clearly and completely.

Length: 2 pages typed, double-spaced.

Note: Wikipedia is not an acceptable source of information.

Required Reading: Available via the Internet:

Trochim, W.M.K. (2006). Variables.Retrieved from http://www.socialresearchmethods.net/kb/variable.php Retrieved February 23, 2012

Trochim, W.M.K. (2006).Levels of measurement. Retrieved from http://www.socialresearchmethods.net/kb/measlevl.php Retrieved February 23, 2012