After surgery a patient's blood volume is often depleted. In one study, the total circulating volume of blood plasma was measured for each patient immediately after surgery. After infusion of a "plasma expander" into the bloodstream, the plasma volume was measured again and the increase in plasma volume (ml) was calculated. Two of the plasma expanders used were albumin (25 patients) and polygelatin (14 patients). The accompanying table reports the increase in plasma volume.

(a) What is the value of the / test statistic for comparing the means?
(b) The P-value for the t test is 0.0007. If α = 0.01, what is your conclusion regarding H0?

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Albumin Polygelatin /2 mean increase SE 25 490 60 14 240 30