Null Hypothesis

• Why do we use the null hypothesis in experiments?

  To test if an observed effect is real or random
• What does it mean if you reject the null hypothesis?

  A relationship exists between variables
• Why is the null hypothesis important for evaluating results?

  It helps determine statistical significance
• What does failing to reject the null hypothesis suggest?

  There is no significant relationship
• How do the null and alternative hypotheses help in research?

  • Determine if observed effects are real
  • Assess if results are due to random chance
• What is the null hypothesis in evaluating new educational methods?

  The new style does not change student scores
• What does the alternative hypothesis suggest?

  There is a relationship between variables
• What would indicate the effectiveness of the new learning method?

  Significantly higher scores in the experiment
• What does the null hypothesis state in the study of social behaviors related to violent movies?

  Watching violent movies does not increase aggression
• What does the null hypothesis claim about observed results?

  They are due to chance
• What does the null hypothesis state?

  There is no relationship between variables
• How does the null hypothesis relate to the variables in a study?

  It asserts no effect or relationship exists
• In a drug effect study, what would the alternative hypothesis be?

  The drug does lower or raise blood pressure
• What happens if the experiment shows significantly higher scores?

  You would reject the null hypothesis
• What is the role of the null hypothesis in experimental design?

  It guides the entire testing process
• In testing a new drug's effect on blood pressure, what would the null hypothesis be?

  The drug does not affect blood pressure
• How does a decrease in blood pressure challenge the null hypothesis?

  It suggests the drug is effective
• What is the purpose of the null hypothesis?

  To assume nothing special is happening
• How does the null hypothesis contribute to drawing conclusions in experiments?

  It ensures conclusions are based on evidence
• What is a null hypothesis?

  A statement that there is no effect
• In medical treatment research, what is the null hypothesis regarding a new drug for cholesterol?

  The drug does not affect cholesterol levels