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Group Design

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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between the two are due to...

Surveys

Surveys

Often, psychologists develop surveys as a means of gathering data. Surveys are lists of questions to be answered by research participants, and can be delivered as paper-and-pencil questionnaires, administered electronically, or conducted verbally. Generally, the survey itself can be completed in a short time, and the ease of administering a survey makes it easy to collect data from a large number of people.

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Systematic Sampling Method

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Related Experiment Video

Updated: Jun 20, 2026

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Published on: September 11, 2021

Maximizing Efficiency of Enrollment for School-Based Educational Research.

Michèle M M Mazzocco¹, Gwen F Myers

¹Kennedy Krieger Institute, Baltimore, Maryland and Johns Hopkins University School of Medicine and School of Public Health.

Journal of Applied Social Psychology

|September 15, 2009

Summary

A principal's cover letter for an educational study sped up recruitment but did not significantly increase overall enrollment numbers. This finding impacts strategies for educational research participant recruitment.

Related Experiment Videos

Last Updated: Jun 20, 2026

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Published on: September 11, 2021

Area of Science:

Educational Research
Research Methodology
Social Sciences

Background:

Effective participant recruitment is crucial for educational research.
Understanding factors influencing enrollment can optimize study timelines and success.
Longitudinal studies require sustained engagement from participants.

Purpose of the Study:

To examine the influence of a school principal's cover letter on research enrollment.
To assess the impact of this intervention on recruitment pace and final enrollment numbers.
To determine the effectiveness of principal endorsement in educational research recruitment.

Main Methods:

Observational study design.
Recruitment materials sent to parents of kindergartners across 7 public schools.
Intervention group received a cover letter from the school principal; control group did not.

Main Results:

Inclusion of a principal's cover letter significantly accelerated the recruitment pace.
The cover letter was associated with a slight, though not statistically significant, increase in enrollment numbers after controlling for confounding variables.
The intervention reduced the time to achieve final enrollment counts by 6 weeks.

Conclusions:

A principal's cover letter can expedite recruitment for educational research studies.
While it speeds up enrollment, it may not substantially increase the total number of participants.
This strategy is effective for improving the efficiency of research enrollment timelines.