Question: An enterprising practitioner of yoga contends that yoga has improved her patients’ flexibility. To prove her clam she cites data obtained from 15 patients who completed a flexibility scale before and after yoga. By subtracting their function prior to treatment from their level after treatment she was able to conclude yoga provided up to a 40% increase in flexibility. Her scale was:

0 = poor flexibility

1 = slight flexibility

2 = some flexibility

3 = average flexibility

4 = excellent flexibility

Is her claim credible? Please explain why.

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