In this discussion, you will evaluate a research question and determine how that question might best be analyzed. To do this, you will need to identify the appropriate application of course specified statistical tests, examine assumptions and limitations of course specified statistical tests, and communicate in writing critiques of statistical tests.
A researcher wishes to study the effect of a new drug on blood pressure. Consider and discuss the following questions as you respond:
- Would you recommend using a z-test, a t-test, or an ANOVA for the analysis? Explain your answer.
- What would your choice of test depend on? For the test you select, explain your design and your comparison groups.
- Would the hypothesis be directional or non-directional?
- Would the test be one-tailed or two-tailed?
- What would be the null and what would be the alternative hypothesis?
Aman, M. G., Hollway, J. A., McDougle, C. J., Scahill, L., Tierney, E., McCracken, J. T., . . . Posey, D. J. (2008). Cognitive effects of risperidone in children with autism and irritable behavior. Journal of Child and Adolescent Psychopharmacology, 18(3), 227-236. doi:http://dx.doi.org/10.1089/cap.2007.0133. Retrieved from the ProQuest database.
- This is an article on Autism that uses ANOVA as the main type of statistical analysis. This article is necessary to complete the assignment for this week.
Article
Statgraphics Centurion. (2006).Analysis of variance (Links to an external site.)Links to an external site.. Retrieved from http://www.statgraphics.com/analysis_of_variance.htm
- This interactive website describes in detail how to use several types of ANOVA. It also includes examples and graphical displays.
Websites
VassarStats: Website for Statistical Computation (Links to an external site.)Links to an external site.. (http://vassarstats.net)
- This is a website includes tools to calculate many of the statistical tests we cover in this course including t-tests, ANOVA, correlation, and regression. Each calculator includes a tutorial and/or walkthrough.
Web Center for Social Research Methods (Links to an external site.)Links to an external site.. (http://socialresearchmethods.net)
- This website includes links to numerous tools and tutorials relating to statistical concepts, calculations, and scale development.