A sample of 15 patients suffering from asthma participated in an experiment to study the effect of a new treatment on pulmonary function. Among the various measurements recorded were those of forced expiratory volume (liters) in 1 second (FEV1) before and after application of the treatment.

The results were as follows:

Subject Before After Subject Before After 1 1.69 1.69 9 2.58 2.44 2 2.77 2.22 10 1.84 4.17 3 1.00 3.07 11 1.89 2.42 4 1.66 3.35 12 1.91 2.94 5 3.00 3.00 13 1.75 3.04 6 .85 2.74 14 2.46 4.62 7 1.42 3.61 15 2.35 4.42 8 2.82 5.14 On the basis of these data, can one conclude that the treatment is effective in increasing the FEV1 level? Let a ¼ :05 and find the p value.