When should I use the One-sample t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal. More than two treatment groups where a normal distribution can be assumed. O Compare categorical frequency data with an expected population proportion. No difference between observed and expected proportions is used as the null hypothesis. O Compare more than two treatment groups when a normal distribution cannot be met. O Compare two treatment groups when a normal distribution cannot be assumed. O Compares numerical data to a known mean. The null hypothesis is that the mean of the data equals the known mean.

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