Field Experiment — Previous Year Questions

📊 Topic Overview

Metric	Value
Papers Appeared	8 of 28 (28.6%)
Priority	🟡 MEDIUM
Section Distribution	Sec A: 4 | Sec B: 2 | Sec C: 2
Most Repeated	Field experiment vs experimental research / steps and strengths (4 times)
Probability	Medium

🎯 Must-Know Concepts

1. Definition and characteristics of field experiment
2. Steps in conducting a field experiment
3. Strengths and weaknesses of field experiments
4. Difference from laboratory experiment
5. Examples of field experiments in psychology

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🔥 Key Question: Field Experiment — Steps, Strengths & Weaknesses (Section A/B)

Answer (~400 words):

Definition: A field experiment is a research method in which the researcher manipulates an independent variable in a natural, real-world setting rather than in a controlled laboratory. Unlike correlational or quasi-experimental research, the researcher actively controls the IV. Unlike laboratory experiments, participants are typically unaware they are in a study, which enhances ecological validity.

Classic example: Darley and Latané's (1968) bystander intervention studies, Milgram's obedience studies (partially), and traffic-safety interventions in real communities.

Characteristics:

1. IV is actively manipulated by the researcher.
2. Takes place in a natural setting (field).
3. Participants are usually unaware of their participation.
4. Random assignment may or may not be possible.
5. Less control over extraneous variables than lab experiments.

Steps in Conducting a Field Experiment:

1. Identify research question and formulate hypothesis: Frame a clear, testable hypothesis about real-world behaviour.
2. Select the field setting: Choose a natural environment where the behaviour of interest occurs (school, hospital, public space).
3. Operationalise variables: Define how the IV will be manipulated and how the DV will be measured in the field.
4. Plan for randomisation: If possible, randomly assign units (individuals, groups, classrooms) to conditions.
5. Pilot test procedures: Test feasibility of manipulation and measurement in the field setting.
6. Implement the intervention: Introduce the IV manipulation without alerting participants.
7. Collect data: Observe or measure DV using unobtrusive measures or covert observation.
8. Control for extraneous variables: Attempt to hold constant any field conditions that might confound results.
9. Analyse and interpret data: Use appropriate statistical analysis; account for clustering if groups are the unit of assignment.
10. Debrief (if ethically required): Inform participants after data collection.

Strengths:

Strength	Explanation
Ecological validity	Behaviour occurs in natural context
Reduced demand characteristics	Participants unaware, so less likely to alter behaviour
External validity	Findings generalise to real-world settings
Practical applicability	Tests interventions in realistic conditions

Weaknesses:

Weakness	Explanation
Poor control	Cannot eliminate all extraneous variables
Ethical issues	Studying people without informed consent raises ethical concerns
Replication difficulty	Natural settings vary; hard to replicate exactly
Measurement challenges	DV measurement in natural settings is complex
Possible attrition	Participants may drop out or move settings

Lab vs Field Experiment:

Dimension	Laboratory Experiment	Field Experiment
Setting	Controlled lab	Natural environment
IV control	High	Moderate
Random assignment	Usually yes	Sometimes yes
Ecological validity	Low	High
Demand characteristics	Higher	Lower
Ethical scrutiny	Moderate	Higher (deception in natural settings)

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🧠 Memory Aids

Strengths (EREP): Ecological validity, Reduced demand characteristics, External validity, Practical applicability

Weaknesses (PERMA): Poor control, Ethical issues, Replication difficulty, Measurement challenges, Attrition

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📚 Related Content

• Field and Laboratory Experiments
• Experimental Research Design

✅ Self-Assessment

1. What makes a field experiment different from a laboratory experiment?
2. Why might participants' behaviour be more natural in a field experiment?
3. What are two major ethical concerns in field experiments?
4. Give a real-world example of a field experiment in psychology.
5. When is a field experiment preferable to a laboratory experiment?

💡 Exam Tips

• Often asked as a comparison with lab experiments — always provide the comparison table.
• Steps are frequently tested in Section A (4 appearances) — know all 10 steps.
• Ecological validity is the key advantage; poor control is the key disadvantage — emphasise these.