Callahan (2009) demonstrated that tai chi can significantly reduce symptoms for individuals with arthritis. Participants were 18 years old or older with doctor-diagnosed arthritis. Self-reports of pain and stiffness were measured at the beginning of an eight-week tai chi course and again at the end. Suppose that the data produced an average of MD = 8.5 decrease in pain and stiffness of with a standard deviation of 21.5 for a sample of n = 40 participants. Use a two-tailed test with α = .05 to determine whether the tai chi had a significant effect on pain and stiffness.

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Description: Callahan (2009) demonstrated that tai chi can significantly reduce symptoms for individuals with arthritis. Participants were 18 years old or older with doctor-diagnosed arthritis. Self-reports of pain and stiffness were measured at the beginning of

Given that, Number of participants in the sample 40. Mean difference of the sample=8.5 Standard…

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Callahan (2009) demonstrated that tai chi can significantly reduce symptoms for individuals with arthritis. Participants were 18 years old or older with doctor-diagnosed arthritis. Self-reports of pain and stiffness were measured at the beginning of an eight-week tai chi course and again at the end. Suppose that the data produced an average of MD = 8.5 decrease in pain and stiffness of with a standard deviation of 21.5 for a sample of n = 40 participants. Use a two-tailed test with α = .05 to determine whether the tai chi had a significant effect on pain and stiffness.

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