Benign prostatic hyperplasia is a noncancerous enlargement of the prostate gland that adversely affects the quality of life of millions of men. A study of a minimally invasive procedure for the treatment for this condition looked at pretreatment quality of life (QOL_BASE) and quality of life after three months on treatment (QOL_3MO). The data is shown on the following table: Participant QOL_BASE QOL__3MO 1 2 1 2 4 1 3 3 1 4 4 3 5 5 2 6 6 2 7 4 2 8 4 5 9 3 3 10 3 1 Calculate differences in quality of life scores (delta) for each participant.

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