Tipos de HIPOTESIS I Hipótesis Parte 2 I Metodología de la Investigación
Understanding Types of Hypotheses
Introduction to Hypotheses
- José Luis López introduces the topic of hypotheses, indicating this video is a continuation from a previous lesson on what a hypothesis is and its purpose.
Classification of Hypotheses
- According to Hernández Fernández and Batista, hypotheses can be classified in various ways; one popular classification includes research hypotheses, null hypotheses, and alternative hypotheses.
Research Hypotheses
- Research hypotheses are tentative propositions about potential relationships between two or more variables. They are typically represented as H (uppercase) followed by h (lowercase), with multiple hypotheses numbered (e.g., H1, H2).
- These can be descriptive or causal. For example, predicting a 25% increase in adolescent pregnancies over three years in Ecuador illustrates a research hypothesis.
Correlational Hypotheses
- Correlational hypotheses specify relationships between variables. An example is the link between tobacco addiction and lung cancer.
- They indicate that when one variable increases, another does too; conversely, if one decreases, so does the other.
Causal Hypotheses
- Causal hypotheses assert not only that variables are related but also establish cause-and-effect relationships. For instance, strict parenting leading to low self-esteem in children exemplifies this type.
- It’s crucial to differentiate correlation from causation; correlation must be established before causation can be claimed.
Establishing Causality
- A university's marketing campaign may correlate with increased enrollment; however, without proving causality—such as ruling out other factors—one cannot definitively say the campaign caused the increase.
Null Hypotheses
- Null hypotheses negate claims made by research hypotheses. Examples include asserting no relationship between self-esteem and intelligence or unemployment rates remaining unchanged.
Importance of Null Hypotheses
- The concept is illustrated through an analogy involving swans: finding just one non-white swan disproves the claim that all swans are white.
Alternative Hypotheses
- Alternative hypotheses (H₁ or h₁) come into play when neither research nor null hypotheses suffice for explanation.
Example Comparison of All Three Types
- An example involving election predictions illustrates how each type functions:
- Research: The liberal party candidate will receive 40%-50% of votes.
- Null: The candidate will not receive 40%-50%.
- Alternative: The candidate will receive more than 50%.
Summary Points
- One: Hypotheses guide research as tentative propositions answering investigative questions.
- Two: They should closely relate to problem statements and literature reviews rather than mere intuition.
Hypotheses in Research
Types of Hypotheses
- The discussion introduces the concept of hypotheses, specifically focusing on research hypotheses, null hypotheses, and alternative hypotheses.
- Within research hypotheses, three main types are identified: descriptive, correlational, and causal hypotheses.
- Descriptive hypotheses aim to outline characteristics or phenomena without establishing relationships.
- Correlational hypotheses explore the relationship between two or more variables without implying causation.
- Causal hypotheses assert a cause-and-effect relationship between variables.
Conclusion