Headaches A physical therapist suggests that soft tissue therapy and spinal manipulation help to reduce the lengths of time patients suffer from headaches. The table shows the numbers of hours per day...

Headaches A physical therapist suggests that soft tissue therapy and spinal manipulation help to reduce the lengths of time patients suffer from headaches. The table shows the numbers of hours per day 11 patients suffered from headaches before and after 7 weeks of receiving treatment. At a = 0.01, is there enough evidence to support the therapist's claim?
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