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A physical therapist suggests that soft tissuemassage therapy helps to reduce the number of days per week that patients suffer fromheadaches. The following tables show

A physical therapist suggests that soft tissuemassage therapy helps to reduce the number of days per week that patients suffer fromheadaches. The following tables show the number of days that a sample of 18 patients suffered from headaches before and after 6 weeks of receiving massage therapy.

What is the level of measurement of each set of data? Explain your reasoning.

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