Critical Thinking and the Scientific Method

Critical Thinking Tools and the Scientific Method

• Overview of critical thinking and the scientific approach.

Intuition & Common Sense

• Many individuals believe intuition and common sense are sufficient for answering questions.

• However, intuition and common sense are prone to errors.

Limits of Intuition

• Personal interviewers may over-rely on their "gut feelings" when assessing job candidates.

• This can lead to misjudgments.

Hindsight Bias

• Defined as the "I-knew-it-all-along" effect.

• After knowing an event's outcome, individuals often feel they could have predicted it.

Overconfidence

• People may overestimate their knowledge or abilities.

• Example: In a study by Goranson (1978), participants estimated it would take about 10 seconds to unscramble anagrams, but it averaged 3 minutes.

The Scientific Attitude

• Comprises three components:

  • Curiosity: Passion for exploration and discovery.

  • Skepticism: Doubting and questioning assumptions.

  • Humility: Accepting responsibility for mistakes.

Critical Thinking

• Involves not accepting conclusions blindly.

• Key aspects include:

  • Examining assumptions.

  • Discerning hidden values.

  • Evaluating evidence.

  • Assessing conclusions.

Asking and Answering Questions

• Utilizes:

  • The Scientific Method

  • Description

  • Correlation

  • Experimentation

Research Process

1. Theories: Generate or refine theories; e.g., low self-esteem feeding depression.

2. Hypotheses: Formulate hypotheses from theories; e.g., People with low self-esteem have higher depression scores.

3. Research and Observations: Conduct tests to observe relationships between variables.

Common Research Methods

Summary

• Includes case studies, surveys, and naturalistic observations to describe behaviors.

Case Study

• Technique focusing in-depth on one person or group to reveal behavioral principles.

• Example: Investigating if language is uniquely human.

Survey

• Technique to ascertain self-reported attitudes and opinions through questioning a representative sample.

Survey Wording

• Survey results can be influenced by wording; e.g.,

  1. "Should advertisements for skin whitening products be allowed on television?"

  2. "Should advertisements for skin whitening products be forbidden on television?"

Survey Random Sampling

• A random sample ensures each population member has an equal chance of inclusion, avoiding bias.

• Example: Analyzing the marble color ratio with random sampling.

Naturalistic Observation

• Observing and recording behavior in natural environments without interference, capturing all behaviors of interest.

Correlation

• Definition: When two traits coincide, they are said to correlate.

• Correlation Coefficient:

  • Indicates the correlation's direction (positive/negative).

  • Indicates the strength of the relationship (0.00 to 1.00).

  • Example: r = 0.37.

Correlation and Causation

• Correlation does not imply causation, leading to misinterpretations.

  1. Low self-esteem could cause depression.

  2. Depression could lead to low self-esteem.

  3. Distressing events or biological factors might cause both.

Illusory Correlation

• Perception of a relationship that does not exist; e.g., children conceived after adoption.

Experimentation: Exploring Cause and Effect

• Experiments isolate causes and their effects, manipulating interests while controlling other factors.

Independent Variable

• The factor manipulated in an experiment; e.g., breast-feeding in intelligence studies.

Dependent Variable

• The variable that may change in response; usually behavior or mental processes; e.g., intelligence levels in breast-fed vs. formula-fed individuals.

Random Assignment

• Minimizes pre-existing differences between groups, ensuring valid result comparisons.

Double-blind Procedure

• In therapy evaluations, both patients and assistants must be unaware of who receives real treatment vs. placebo.

Comparing Research Methods

Overview of Methods