The authors of the paper “Mean Platelet Volume Could Be Possible Biomarker in Early Diagnosis and Monitoring of Gastric Cancer” (Platelets [2014]: 592–594) wondered if mean platelet volume (MPV) might be a way to distinguish patients with gastric cancer from patients who did not have gastric cancer. MPV was recorded for 31 patients with gastric cancer. The sample mean was reported to be 8.31 femtoliters (fL) and the sample standard deviation was reported to be 0.78 fL. For a group of healthy people, the mean MPV was 7.85 fL. Is there convincing evidence that the mean MPV for patients with gastric cancer is greater than 7.85 fL? For purposes of this exercise, you can assume that the sample of 31 patients with gastric cancer is representative of the population of all patients with gastric cancer.