Randomization, or the random selection and assignment of participants based solely on chance, is the foundational element of experimental designs, reducing alternative explanations for the effects the researcher is measuring. Random selection involves the procedure used to identify participants to be members of a sample, while random assignment involves the procedure used to assign identified participants to the various groups within a study.
Review the resources listed in the Books and Resources area below to prepare for this weeks assignment(s).
All resources for this week:
Book(s)
Mertens, D. 2014 Research and evaluation in education and psychology. Integrating diversity with quantitative, qualitative, and mixed methods.
Review Chapter 4
Website Link(s)
Trochim, W. M. K. (2012). Design. The Research Knowledge Base. https://www.socialresearchmethods.net/kb/design.php
Read Subsections: Experimental Design, Relationships between Pre/Post-Designs
Trochim, W. M. K. (2012). Sampling. The Research Knowledge Base. https://www.socialresearchmethods.net/kb/sampling.php
Read all Subsections
Assignment Title
Analyze Experimental (Randomized) Designs
Assignment Points
10
Assignment Instructions
Whenever an experiment is conducted using samples rather than the entire population, there is innate uncertainty. Regardless of how large or how well-drawn the sample, all aspects of the entire population cannot be fully represented. An experimental design based on randomization provides maximum control as humanly possible of this innate uncertainty.
Assume you have been asked to speak to a group of beginning doctoral students who have just started an introductory research methods course. Based on the assigned readings and additional research, create a multimedia PowerPoint presentation to address the following information:
Discuss the distinction between random selection and random assignment. Determine how random selection and random assignment would contribute to the reduction of uncertainty. Provide examples to illustrate your findings.
Explain how random selection and assignment might help to reduce experimental error and mitigate threats to validity.
Select at three sampling methods to critique, then discuss the procedure and benefits of each.
Incorporate appropriate animations, transitions, and graphics as well as speaker notes for each slide. The speaker notes may be comprised of brief paragraphs or bulleted lists.
Support your presentation with at least five scholarly resources. In addition to these specified resources, other appropriate scholarly resources may be included.
Length: 12-15 slides (with a separate reference slide)
Notes Length: 200-350 words for each slide
Be sure to include citations for quotations and paraphrases with references in APA format and style where appropriate. Save the file as PPT with the correct course code information. Upload your assignment using the Upload Assignment button below.
Course Learning Outcomes associated with this assignment:
1.0. Evaluate quantitative research designs with attention to quantitative instrumentation, data assumptions, validity, and reliability.
2.0. Analyze the rationale and methodological conventions of quantitative data collection techniques used in educational research.
3.0. Analyze the rationale and methodological conventions of quantitative data analysis techniques used in educational research.
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