Alternative hypothesis

October 6, 2025 - Namely, there is sufficient evidence against null hypothesis to demonstrate that the alternative hypothesis is true. One example is where water quality in a stream has been observed over many years, and a test is made of the null hypothesis that "there is no change in quality between the first and second halves of the data", against the alternative hypothesis that "the quality is poorer in the second half of the record".

August 30, 2025 - The null hypothesis, denoted Ho, is the default position where variables do not have a relation with each other. That means the null hypothesis is assumed true until evidence indicates otherwise. The alternative hypothesis, denoted H1, on the other hand, opposes the null hypothesis.

Null Hypothesis: H0: Experience on the job has no impact on the quality of a brick mason’s work. Alternative Hypothesis: Ha: The quality of a brick mason’s work is influenced by on-the-job experience.

January 24, 2025 - The table below gives examples of research questions and null hypotheses. There’s always more than one way to answer a research question, but these null hypotheses can help you get started. *Note that some researchers prefer to always write the null hypothesis in terms of “no effect” and “=”. It would be fine to say that daily meditation has no effect on the incidence of depression and p1 = p2. The alternative hypothesis (Ha) is the other answer to your research question.

November 22, 2021 - So if according to a null hypothesis something is correct to an alternate hypothesis that same thing will be incorrect. For example, let’s assume that you develop a null hypothesis that states “I”m going to be $500 richer” the alternate hypothesis will be “I’m going to get $500 or be richer”

This practice is acceptable because we only make the decision to reject or not reject the null hypothesis. H0: No more than 30% of the registered voters in Santa Clara County voted in the primary election. p ≤ 30 · Ha: More than 30% of the registered voters in Santa Clara County voted in the primary election. p > 30 · A medical trial is conducted to test whether or not a new medicine reduces cholesterol by 25%. State the null and alternative hypotheses.

For example, the two different teaching methods did not result in different exam performances (i.e., zero difference). Another example might be that there is no relationship between anxiety and athletic performance (i.e., the slope is zero). The alternative hypothesis states the opposite and ...

The choice between a one-tailed or a two-tailed test needs to be done in such a way that the interpretation of a rejection is always coherent with the alternative hypothesis. ... Example As in the previous example, consider a test about the mean of a normal distribution, where we test .

August 16, 2024 - For instance, you can have a null hypothesis that says the melting point of aluminum is equal to 1,221 degrees, and your alternative hypothesis may say the melting point is greater than 1,221 degrees. Related: What Is a Null Hypothesis? (Definitions, Examples and FAQs)

October 6, 2024 - Example 1: It’s an accepted fact that ethanol boils at 173.1°F; you have a theory that ethanol actually has a different boiling point, of over 174°F. The accepted fact (“ethanol boils at 173.1°F”) is the null hypothesis; your theory (“ethanol boils at temperatures of 174°F”) is the alternate hypothesis.

3 weeks ago - Example: “Does a new medicine work better than the old one?” · Decide on the variable you are testing (mean, proportion, etc.). Suppose it’s the average score of students. Write the null hypothesis as “no effect” (e.g., H0: μ = μ0).

February 25, 2017 - If you are performing a two-tailed hypothesis test, the alternative hypothesis states that the population parameter does not equal the null hypothesis value. For example, when the alternative hypothesis is HA: μ ≠ 0, the test can detect differences both greater than and less than the null value.

The hypothesis that we want to test is called a null hypothesis, while the opposite is called the alternative hypothesis. In the above coin-toss example, the null hypothesis is that the coin is not biased (i.e., the probability of obtaining heads is

June 24, 2019 - If the null hypothesis is not rejected, then we do not accept the alternative hypothesis. Going back to the above example of mean human body temperature, the alternative hypothesis is “The average adult human body temperature is not 98.6 degrees Fahrenheit.”

August 28, 2019 - To check the water quality of a river for one year, the researchers are doing the observation. As per the null hypothesis, there is no change in water quality in the first half of the year as compared to the second half. But in the alternative hypothesis, the quality of water is poor in the second half when observed...

January 13, 2016 - The alternative hypothesis is that the proportion of blood glucose affected by the medicine is not equal to 0.25. ... Let's look at another example of an alternative hypothesis in statistics.

March 27, 2020 - In medicines development one might for example formulate the hypothesis that a new treatment for a disease is better than the existing standard of care treatment. If the new treatment is called ‘B’, and the standard of care treatment is called ‘A’ then the hypothesis states that ‘B’ is better than ‘A’. This hypothesis would be referred to as the alternative hypothesis.

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April 28, 2023 - One hypothesis is that the proportion of vegetarians is 5%. The other hypothesis is that the proportion of vegetarians is greater than 5%. In statistics, we would call the first hypothesis the null hypothesis, and the second hypothesis the ...

September 1, 2022 - On a state driver's test, about 40% pass the test on the first try. We want to test if more than 40% pass on the first try. State the null and alternative hypotheses. ... In a hypothesis test, sample data is evaluated in order to arrive at a decision about some type of claim.