Help with a paper please?

In developmental psychology, the focus of research is often to
examine change over time. Developmental psychologists have some special
research designs that allow them to accomplish this. Two such research
designs are the cross-sectional design and the longitudinal design. A
cross-sectional design measures different groups of people of different
ages at the same time. A longitudinal design measures the same group of
people at different ages and also, therefore, at different times.

Use your textbook and the Argosy University online library resources
to identify and research a topic in adult development (e.g., memory,
muscle strength, etc.) that you wish to examine across various age
agroups. Develop an outline for either a cross-sectional or longitudinal
research design. Write a paper consisting of the following
information:

• An introduction to the topic you selected, including a summary of at
  least one peer-reviewed journal article describing recent research
  (post 2005) on the topic;
• A description of how you will measure the topic of study (e.g., the dependent variable).
• A description of which type of design will be used and why that
  would be most appropriate. Also identify what age groups will be
  studied.
• On the basis of your readings and research, provide a prediction of what you expect to find upon completion of your study.

Apply APA standards to citation of sources. Your paper should be
double-spaced with one-inch margins, written in APA style, and free of
typographical and grammatical errors. It should include a title page
with a running head and a reference page. The body of the paper should
be 3-5 pages in length.