In research, which hypothesis is assumed to be true until evidence suggests otherwise?

• A. Alternative Hypothesis
• B. Research Hypothesis
• C. Null Hypothesis
• D. Directional Hypothesis

Answer: (C)

The null hypothesis is a fundamental concept in research methodology and is assumed to be true until evidence suggests otherwise. It serves as the default position in statistical testing and posits that there is no effect, relationship, or difference between the groups being studied. For example, in a clinical trial, the null hypothesis might state that a new treatment does not lead to any improvement compared to a placebo.

Researchers begin their investigations with this assumption and design studies to gather evidence that might lead to the rejection of the null hypothesis. If sufficient statistical evidence is presented, indicating that the data significantly contradict the null hypothesis, researchers may reject it in favor of the alternative hypothesis, which posits that there is indeed an effect or relationship.

Understanding this concept is crucial as it underpins how statistical significance is determined and helps ensure that conclusions drawn from research are based on empirical evidence rather than assumptions or biases.