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A researcher believes that he has developed a training protocol that will help reduce muscle tension in the head, and therefore help reduce muscle tension

A researcher believes that he has developed a training protocol that will help reduce muscle tension in the head, and therefore help reduce muscle tension headaches. 9 subjects record the frequency of their muscle tension headaches for 2 weeks. Next, they participate in the 6 weeks training protocol the research has developed. After that, the subjects are asked to again record the frequency of their muscle tension headaches for another 2 weeks. Here is the data from the study:

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