How to Write the Population and Sample for an Education Dissertation

How to Write the Population and Sample for an Education Dissertation

The population and sample section of an education dissertation explains who will participate in the study, how participants will be selected, and why the selected group is appropriate for addressing the educational research problem. This section is typically included in Chapter 3 (Methodology) and is essential for demonstrating methodological rigor, credibility, and alignment with the research design.

In education research, the population and sample section is especially important because studies often involve:

• Students

• Teachers

• School administrators

• Faculty members

• Parents or educational stakeholders

• Schools or districts

A strong section clearly identifies:

• The target population

• Sample size

• Sampling strategy

• Inclusion and exclusion criteria

• Recruitment procedures

• Ethical considerations

In simple terms, this section answers: “Who is being studied in this education dissertation, and how were participants selected?”

What Is the Population in an Education Dissertation?

The population is the larger group the researcher wants to study or understand.

In education dissertations, populations commonly include:

• K–12 students

• College or university students

• Teachers or faculty

• School administrators

• Online learners

• Parents or caregivers

• Educational institutions or districts

The population should align directly with:

• The educational problem

• Research questions

• Methodology and research design

Example Population Statement

The target population for this study consisted of middle school teachers employed in public schools within urban school districts in the United States.

What Is the Sample in an Education Dissertation?

The sample is the smaller group selected from the population to participate in the study.

Because it is usually impractical to study an entire educational population, researchers recruit a manageable sample that reflects the characteristics of the larger group.

Example Sample Statement

The sample included 30 middle school teachers with at least two years of experience teaching in online or blended learning environments.

Why the Population and Sample Section Matters in Education Research

This section demonstrates:

• Appropriate participant selection

• Methodological rigor

• Alignment between research questions and participants

• Ethical recruitment procedures

• Feasibility of the study

Dissertation committees expect researchers to justify:

• Why the participants were selected

• How sampling aligns with methodology

• Whether the sample is appropriate for answering the research questions

Where Is the Population and Sample Section Located?

This section is typically included in:

• Chapter 3: Methodology

Common headings include:

• Population

• Sample

• Participants

• Sampling Procedures

• Recruitment Procedures

Step-by-Step: How to Write the Population and Sample Section for an Education Dissertation

Step 1: Identify the Target Population

Clearly define the larger educational group relevant to the study.

Include:

• Participant type

• Educational role or level

• Geographic or institutional setting

• Relevant characteristics

Example:

The target population consisted of undergraduate students enrolled in fully online education programs at public universities in the United States.

Step 2: Describe the Sample

Explain the specific participants selected from the population.

Include:

• Estimated sample size

• Participant demographics

• Relevant educational characteristics

Example:

The sample included 150 undergraduate students enrolled in online teacher education programs during the 2025–2026 academic year.

Step 3: Explain the Sampling Method

Describe how participants were selected.

Common Sampling Methods in Education Research

Quantitative Education Studies

Random Sampling

Participants selected randomly from the population.

Stratified Sampling

Participants selected from specific educational subgroups.

Convenience Sampling

Participants selected based on accessibility.

Qualitative Education Studies

Purposive Sampling

Participants selected because they have direct experience with the educational phenomenon.

Criterion Sampling

Participants selected based on specific educational criteria.

Snowball Sampling

Participants recruit additional participants.

Example:

Purposive sampling was used to recruit teachers who had experience implementing project-based learning strategies.

Step 4: Justify the Sample Size

Explain why the sample size is appropriate.

Quantitative Education Studies

Sample size may be justified using:

• Statistical power analysis

• Previous education research

• Anticipated effect sizes

Example:

A sample size of 200 participants was selected to provide adequate statistical power for multiple regression analysis.

Qualitative Education Studies

Sample size is often based on:

• Data saturation

• Depth of participant experience

• Methodological recommendations

Example:

A sample of 12 participants was considered sufficient to achieve thematic saturation.

Step 5: Define Inclusion Criteria

Inclusion criteria explain who is eligible to participate.

Examples:

• Full-time teachers

• Students enrolled in online courses

• Administrators with leadership experience

• Participants over age 18

Example:

Participants were required to have completed at least one semester of online teaching experience.

Step 6: Define Exclusion Criteria

Exclusion criteria explain who cannot participate.

Examples:

• Individuals without relevant educational experience

• Participants under age 18

• Incomplete survey responses

• Substitute or temporary staff

Example:

Teachers without experience using online instructional platforms were excluded from the study.

Step 7: Describe Recruitment Procedures

Explain how participants will be contacted or recruited.

Common recruitment methods in education research include:

• University email announcements

• School district communications

• Professional educator organizations

• Social media groups

• Learning management systems (LMS)

Example:

Participants were recruited through university email announcements distributed to education faculty and graduate students.

Step 8: Address Ethical Considerations

Education dissertations must protect participant rights and confidentiality.

Discuss:

• Informed consent

• Voluntary participation

• Confidentiality and anonymity

• Data security

• Institutional Review Board (IRB) approval

Example:

Participation was voluntary, and all responses were kept confidential in accordance with Institutional Review Board (IRB) guidelines.

Population and Sample Examples for Education Dissertations

Example for a Quantitative Education Study

The population for this study consisted of undergraduate students enrolled in online education courses at public universities in the United States. A convenience sample of 250 students was recruited through institutional email invitations. Participants were required to be at least 18 years old and enrolled in at least one online course during the semester.

Example for a Qualitative Education Study

The population for this phenomenological study included K–12 teachers who transitioned to remote learning during the COVID-19 pandemic. Purposive sampling was used to recruit 10 teachers with at least two years of online teaching experience.

Common Mistakes in the Population and Sample Section

Avoid:

• Vague participant descriptions

• No justification for sample size

• Misalignment between methodology and sampling method

• Weak recruitment explanations

• Missing inclusion or exclusion criteria

• Ignoring ethical protections for participants

Tips for Writing a Strong Education Population and Sample Section

• Align participants with educational research questions

• Clearly define educational roles and characteristics

• Use appropriate sampling terminology

• Justify sample size logically

• Explain ethical protections thoroughly

• Ensure consistency with methodology and research design

Quantitative vs. Qualitative Sampling in Education Research

Quantitative Education Research	Qualitative Education Research
Larger sample sizes	Smaller sample sizes
Focus on generalizability	Focus on depth of experience
Random or probability sampling	Purposive or criterion sampling
Statistical power important	Data saturation important

Final Thoughts on How to Write the Population and Sample for an Education Dissertation

The population and sample section is a critical component of an education dissertation because it explains who is being studied and how participants were selected. A well-written section demonstrates methodological rigor, ethical planning, and alignment between the educational research problem and participant selection process.

Whether conducting qualitative, quantitative, or mixed methods research, clearly describing the population, sample, sampling strategy, recruitment procedures, and ethical protections strengthens the credibility and trustworthiness of the dissertation.

If you need help selecting a methodology, consider qualitative dissertation coaching! If you need help editing your Chapter 3, please visit our website.