The purpose of a study was to determine the effectiveness of segmental wire fixation in athletes with spondylolysis. Between 1993 and 2000, 20 athletes (6 women and 14 men) with lumbar spondylolysis were treated surgically with the technique. The following table gives the Japanese Orthopaedic Association (JOA) evaluation score for lower back pain syndrome for men and women prior to the surgery. The lower score indicates less pain. Assume that the two populations of pain scores are normally distributed with equal variances. Gender JOA scores Female 14, 13, 24, 21, 20, 21 Male 21, 26, 24, 24, 22, 23, 18, 24, 13, 22, 25, 23, 21, 25 What is the pooled variance? (Answer was calculated using 3 decimals places for intermediate steps.)
The purpose of a study was to determine the effectiveness of segmental wire fixation in athletes with spondylolysis. Between 1993 and 2000, 20 athletes (6 women and 14 men) with lumbar spondylolysis were treated surgically with the technique. The following table gives the Japanese Orthopaedic Association (JOA) evaluation score for lower back pain syndrome for men and women prior to the surgery. The lower score indicates less pain. Assume that the two populations of pain scores are
Gender JOA scores
Female 14, 13, 24, 21, 20, 21
Male 21, 26, 24, 24, 22, 23, 18, 24, 13, 22, 25, 23, 21, 25
What is the pooled variance? (Answer was calculated using 3 decimals places for intermediate steps.)
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