LESSON 13 - EXPERIMENTAL DESIGNS: TRUE EXPERIMENTAL AND QUASI EXPERIMENTAL DESIGNS

LESSON 13 - EXPERIMENTAL DESIGNS: TRUE EXPERIMENTAL AND QUASI EXPERIMENTAL DESIGNS

by Prof. Lydiah Wambugu

Humanities, Social Sciences & Thought Science — General & History GPSResearch methodsGPSBEmpirical research methods
🎙 Prof. Lydiah Wambugu 👥 29K 📅 April 20, 2021 ⏱ 30 min 👁 10K 📄 tutorial 🧭 2026-08-17
Available in: English (current) Français

Keywords

experimental designcausalitycontrol grouprandomizationquasi-experimental

Summary

This lesson provides a comprehensive introduction to experimental designs in social science research. It begins by defining experimental design as a quantitative approach that aims to establish causality. The instructor explains the importance of having two homogeneous groups: a control group and an experimental group, where the latter receives a treatment or intervention. To demonstrate causality, researchers must avoid spurious relationships and control extraneous variables. The lesson details methods for controlling extraneous variables, including randomization, removing the variable, matching cases, and using subjects as their own controls. It then outlines the essential elements of experimental designs: manipulation, randomization, and control. The instructor introduces the symbols used in experimental notation (O for tests, X for treatment) and explains the three types of experimental procedures: pre-experimental, quasi-experimental, and true experimental. Examples of each type are provided, such as the one-group pre-test-post-test design, the pre-test-post-test control group design, and the Solomon four-group design. The lesson concludes by emphasizing the importance of understanding threats to validity, which will be covered in the next session.

170 words

Critical Evaluation

Value of the Information & Strength of the Argument

The video provides a solid foundation in experimental design, clearly explaining key concepts such as causality, spurious relationships, and extraneous variables. The instructor uses relatable examples, like the effect of a teaching methodology on student performance, to illustrate abstract ideas. The argumentation is logical and structured, building from basic definitions to more complex designs. However, the presentation is largely descriptive rather than critical, and it does not engage with potential criticisms or limitations of experimental approaches in social sciences. The value lies in its pedagogical clarity, making it useful for beginners, but it lacks depth for advanced learners.

Scientific Rigor, Source Quality, Title Accuracy

The video is a self-contained lecture without explicit citations to external sources. The instructor references her own course materials and provides links to her website and social media, but these are not academic references. The content aligns with standard research methods textbooks, but the lack of citations reduces its scientific rigor. The title accurately reflects the content, focusing on true and quasi-experimental designs. The video does not include any sponsored content or advertisements.

186 words

Title / Content Match

The title accurately reflects the content, which focuses on experimental designs, specifically true and quasi-experimental designs.

Quality & Reliability

7/10

The content is a structured educational lecture on experimental designs, covering key concepts accurately. However, it lacks citations to external sources and relies on the instructor's expertise. The explanations are clear but sometimes oversimplified, and the video is from 2021, so some references may be dated.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

  • Research Methods Course — Full course access mentioned in the video description.
  • YouTube Channel — Link to subscribe to the channel.
  • LinkedIn — Social media link provided in the description.
  • Facebook — Social media link provided in the description.
  • Instagram — Social media link provided in the description.
  • WhatsApp — Live chat link provided in the description.

Concurring Sources

  • Research Methods Knowledge Base — Provides similar explanations of experimental designs and their types.

Dissenting Sources

  • None — No discordant sources were identified; the content aligns with standard research methods literature.

Contribution & Novelties

The video offers a clear and structured introduction to experimental designs, particularly useful for students new to research methods. It effectively distinguishes between true and quasi-experimental designs and explains the importance of controlling extraneous variables. The use of symbols and diagrams helps visualize the designs. However, it does not provide novel insights beyond standard textbook material.

Pour aller plus loin :

113 words

Radar Profile

The radar profile shows high scores in quantity of information and fiabilite, indicating a comprehensive and reliable overview. The technical level is moderate, making it accessible to beginners. The quality of information is good but not exceptional, as it lacks critical depth.

Reliability 7/10

💬 No comments were provided for analysis.