Methods Section: Chapter Three

The methods section, or chapter three, of the dissertation or thesis is often the most challenging for graduate students.  Initially, chapter three should restate the research questions and hypotheses. Then, it should outline the research design, followed by a description of the participants, instruments, and procedure. Finally, it should explain the data analysis plan and justify the sample size.

Research Questions and Null Hypotheses

Chapter three should begin with a portion that discusses the research questions and null hypotheses. In the research questions and null hypotheses portion of the methodology chapter, restate the research questions in statistical language.  For example, “Is there a difference in GPA by gender?” is a t-test type of question, whereas “Is there a relationship between GPA and income level?” is a correlation type of question.  The important thing to remember is to use the language that foreshadows the data analysis plan. State the null hypotheses as the research questions in their null form, such as “There is no difference in GPA by gender” or “There is no relationship between GPA and income level.”

Research Design

The next portion of chapter three focuses on developing the research design.  The research design has several possibilities. First, you must decide if you are doing quantitative, qualitative, or mixed methods research. In a quantitative study, you are assessing participants’ responses on a measure.  For example, participants can endorse their level of agreement on some scale.  A qualitative design typically uses semi-structured interviews, transcribes them, and derives themes from the participants’ responses.  A mixed methods project is a mixture of both a quantitative and qualitative study.

Participants

In the research methodology, the participants are typically a sample of the population you want to study.  You are probably not going to study all school children, but you may sample from the population of school children.  You need to include information about the characteristics of the population in your study (Are you sampling all males? teachers with under five years of experience?).  This represents the participants portion of your methods section, chapter three.

Instruments

The instruments section is a critical part of the methodology section, chapter three.  The instruments section should include the name of the instruments, the scales or subscales, how the scales are computed, and the reliability and validity of the scales. Additionally, this portion should reference the researchers who developed the instruments.

Procedure

The procedure section of the methods chapter is simply how you are going to administer the instruments that you just described to the participants you are going to select.  You should walk the reader through the procedure in detail so that they can replicate your steps and your study.

Data Analysis Plan

The data analysis plan is just that — how you are going to analyze the data when you get the data from your participants.   It includes the statistical tests you are going to use, the statistical assumptions of these tests, and the justification for the statistical tests.

Sample Size Justification

Another important portion of your methods chapter three, is the sample size justification.  Sample size justification (or power analysis) is selecting how many participants you need to have in your study.  The sample size is based on several criteria:  the power you select (which is typically .80), the alpha level selected (which is typically .05), and the effect size (typically, a large or medium effect size is selected).  Importantly, once these criteria are selected, the sample size is going to be based on the type of statistic: an ANOVA is going to have a different sample size calculation than a multiple regression.