Investigation Design

Psychological Concepts and Significance

• Definition of Key Terms: Clearly define all psychological concepts relevant to your investigation. This demonstrates understanding and provides a foundation for your research. For example:
  • Mental Wellbeing: A state in which an individual realizes their own abilities, can cope with the normal stresses of life, can work productively, and is able to make a contribution to their community.
  • Specific Phobia: A type of anxiety disorder characterized by excessive and persistent fear of a specific object or situation.
• Significance: Explain why these concepts are important in the context of mental processes and psychological functioning. Why is understanding these concepts important for mental wellbeing?

KEY TAKEAWAY: Always start by defining your key psychological concepts to ensure a solid understanding of the research area.

Characteristics of Selected Scientific Methodology and Method

• Scientific Methodology: The overall approach to conducting research (e.g., experimental, correlational, descriptive).
• Scientific Method: A specific procedure used for data collection (e.g., survey, observation, experiment).
• Independent Variable (IV): The variable that is manipulated or changed by the researcher.
• Dependent Variable (DV): The variable that is measured by the researcher.
• Controlled Variables: Variables that are kept constant throughout the experiment to prevent them from influencing the DV. Also known as extraneous variables that are controlled.
• Appropriateness: Justify why the chosen methodology and method are suitable for investigating your research question. For instance, if investigating the effect of mindfulness on stress levels, an experimental design would be appropriate, with mindfulness practice as the IV and stress levels as the DV.
• Experimental Designs:
  • Independent Groups: Participants are randomly allocated to different groups (experimental and control).
    • Advantages: Reduces order effects.
    • Disadvantages: Requires a larger sample size; participant variability.
  • Matched Participants: Participants are paired based on similar characteristics, and then one from each pair is assigned to each group.
    • Advantages: Controls for specific participant variables.
    • Disadvantages: Time-consuming and difficult to match participants perfectly.
  • Repeated Measures: The same participants are used in both the experimental and control conditions.
    • Advantages: Requires fewer participants; controls for participant variables.
    • Disadvantages: Order effects (practice, fatigue, carry-over effects). Counterbalancing can be used to minimize order effects.

EXAM TIP: Be prepared to explain why a specific research design is the most appropriate for a given research question.

Techniques of Primary Quantitative Data Generation

• Primary Data: Data collected directly by the researcher.
• Quantitative Data: Numerical data that can be statistically analyzed.
• Techniques:
  • Surveys/Questionnaires: Using standardized questions to collect data from a large sample. Likert scales, rating scales, and open-ended questions can be used.
  • Experiments: Manipulating the IV to measure its effect on the DV.
  • Observations: Systematically observing and recording behavior.
  • Psychological Tests: Standardized tests to measure cognitive abilities, personality traits, or mental health.
• Examples:
  • Using a Likert scale questionnaire to measure levels of anxiety after a mindfulness intervention.
  • Measuring reaction time in a cognitive task to assess the impact of sleep deprivation.
  • Counting the frequency of specific behaviors in a naturalistic observation study.

STUDY HINT: Practice designing data collection instruments (e.g., questionnaires) and identifying potential sources of bias.

Accuracy, Precision, Repeatability, Reproducibility, and Validity of Measurements

• Accuracy: How close a measurement is to the true value.
• Precision: How consistent a measurement is.
• Repeatability: The ability of the same researcher to obtain the same results using the same methods and equipment.
• Reproducibility: The ability of a different researcher to obtain the same results using the same methods and equipment.
• Validity: The extent to which a test or measurement tool measures what it is supposed to measure.
  • Internal Validity: The extent to which the results of an experiment can be attributed to the manipulation of the IV rather than other factors (confounding variables).
  • External Validity: The extent to which the results of an experiment can be generalized to other populations, settings, or times.
• Improving Validity:
  • Standardization: Using consistent procedures for all participants.
  • Control Groups: Comparing the experimental group to a control group to isolate the effect of the IV.
  • Random Assignment: Randomly assigning participants to experimental and control groups to minimize bias.
• Improving Reliability:
  • Test-retest reliability: Administering the same test to the same individuals on two different occasions and correlating the scores.
  • Inter-rater reliability: The degree of agreement among raters.

COMMON MISTAKE: Confusing accuracy and precision. A measurement can be precise but inaccurate, or accurate on average but not precise.

Health, Safety, and Ethical Guidelines

• Informed Consent: Participants must be fully informed about the nature of the research and provide their voluntary consent to participate.
• Voluntary Participation: Participants must not be coerced or pressured to participate.
• Confidentiality: Participants’ personal information must be kept confidential.
• Right to Withdraw: Participants must be allowed to withdraw from the study at any time without penalty.
• Debriefing: Participants must be provided with a full explanation of the research after their participation.
• Minimizing Harm: Researchers must take steps to minimize any potential physical or psychological harm to participants.
• Ethics Committees: All research must be reviewed and approved by an ethics committee to ensure that it meets ethical standards.
• Vulnerable Participants: Special care must be taken when conducting research with vulnerable populations (e.g., children, individuals with mental health conditions).
• Specific Considerations for Mental Wellbeing Research:
  • Be sensitive to the potential for triggering or exacerbating mental health symptoms.
  • Provide access to support services if needed.
  • Ensure that participants understand the purpose of the research and how the data will be used.

VCAA FOCUS: Ethical considerations are frequently assessed in VCE Psychology exams. Understand the key ethical principles and how they apply to different research scenarios.