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Martyn Shuttleworth 80.8K reads
Share this page on your website: The student's ttest is a statistical method that is used to see if two sets of data differ significantly. This article is a part of the guide:Discover 34 more articles on this topicDon't miss these related articles:
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The method assumes that the results follow the normal distribution (also called student's tdistribution) if the null hypothesis is true. This null hypothesis will usually stipulate that there is no significant difference between the means of the two data sets. It is best used to try and determine whether there is a difference between two independent sample groups. For the test to be applicable, the sample groups must be completely independent, and it is best used when the sample size is too small to use more advanced methods. Before using this type of test it is essential to plot the sample data from the two samples and make sure that it has a reasonably normal distribution, or the student's t test will not be suitable. It is also desirable to randomly assign samples to the groups, wherever possible. ExampleYou might be trying to determine if there is a significant difference in test scores between two groups of children taught by different methods. The null hypothesis might state that there is no significant difference in the mean test scores of the two sample groups and that any difference down to chance. The student's t test can then be used to try and disprove the null hypothesis. .
RestrictionsThe two sample groups being tested must have a reasonably normal distribution. If the distribution is skewed, then the student's t test is likely to throw up misleading results. The distribution should have only one main peak (= mode) near the mean of the group. If the data does not adhere to the above parameters, then either a large data sample is needed or, preferably, a more complex form of data analysis should be used. .
ResultsThe student's t test can let you know if there is a significant difference in the means of the two sample groups and disprove the null hypothesis. Like all statistical tests, it cannot prove anything, as there is always a chance of experimental error occurring. But the test can support a hypothesis. However, it is still useful for measuring small sample populations and determining if there is a significant difference between the groups. .Check out our quizpage with tests about: Full reference:
Martyn Shuttleworth (Feb 19, 2008). Studentâ€™s TTest. Retrieved Aug 20, 2019 from Explorable.com: https://explorable.com/studentsttest You Are Allowed To Copy The TextThe text in this article is licensed under the Creative CommonsLicense Attribution 4.0 International (CC BY 4.0). This means you're free to copy, share and adapt any parts (or all) of the text in the article, as long as you give appropriate credit and provide a link/reference to this page. That is it. You don't need our permission to copy the article; just include a link/reference back to this page. You can use it freely (with some kind of link), and we're also okay with people reprinting in publications like books, blogs, newsletters, coursematerial, papers, wikipedia and presentations (with clear attribution). Related articles. Search over 500 articles on psychology, science, and experiments. .Want to stay up to date? Follow us!.. Footer bottom
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