A study is performed to examine the relationship between the concentration of plasma antioxidant vitamins and cancer risk. Table 7-66, shows data for plasma vitamin-A concentration in stomach cancer...

A study is performed to examine the relationship between the concentration of plasma antioxidant vitamins and cancer risk. Table 7-66, shows data for plasma vitamin-A concentration in stomach cancer patients and in controls (participants similar to the cancer patients but free of disease). Is there a significant vitamins between patients with stomach cancer and controls? Run the appropriate test at a 5% level of significance.

Extracted text: TABLE 7-66 Plasma Antioxidant Vitamins in Cancer Patients and in Controls Mean SD 0.15 20 2.41 Stomach cancer patients 0.19 2.78 50 Controls Z