Which type of the following is set of two hypotheses, which states the opposite of the null hypothesis ?

The correct answer is - Alternative hypothesis

Key Points

• Alternative hypothesis
  • The alternative hypothesis is a statement that suggests a possible outcome or relationship that is contrary to the null hypothesis.
  • It is often denoted as H₁ or H_a and is considered when the null hypothesis is rejected based on evidence from a statistical test.
  • In a hypothesis testing framework, the alternative hypothesis represents a claim or statement that researchers aim to support with data.
  • For example: If the null hypothesis states "There is no difference between two groups," the alternative hypothesis would state "There is a difference between the two groups."

Additional Information

• Null hypothesis
  • The null hypothesis, denoted as H₀, is a default assumption that there is no effect, no difference, or no relationship between variables.
  • It serves as the starting point for hypothesis testing, and researchers aim to either reject or fail to reject the null hypothesis based on the evidence.
  • For example: "The mean test scores of two groups are equal."
• Statistical hypothesis
  • A statistical hypothesis is a formal statement that can be tested using statistical methods and data.
  • It encompasses both the null hypothesis and the alternative hypothesis.
  • Hypothesis testing determines whether the observed data provides sufficient evidence to support or reject these hypotheses.
• Scientific hypothesis
  • A scientific hypothesis is a broader concept that refers to any testable prediction or explanation regarding a scientific phenomenon.
  • It may or may not be formalized into statistical terms and is often used in experimental research.