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One-sample t-tests are used to test if the mean score of a sample significantly ...
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One-sample t-tests are used to test if the mean score of a sample significantly differs from a specific value. The specific value may be any value chosen for scientific reasons; it could be a population mean, a standard value of interest or a mean that has been gathered from previous studies. For instance, we can conduct a one-sample t-test if we are interested in testing the level of self-esteem in a sample of engineering students against a particular value. If self-esteem is measured on a 7-point Likert scale and values above four are regarded as higher self-esteem, whereas values below 4 are regarded as lower self-esteem, then we can test if the mean is significantly different from 4. In one sample t-test, the degrees of freedom = n - - - - -.
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