Protoporphyrin levels were determined for three groups of people—a control group of norm...

Protoporphyrin levels were determined for three groups of people—a control group of normal workers, a group of alcoholics with sideroblasts in their bone marrow, and a group of alcoholics without sideroblasts. The given data appeared in the paper “Erythrocyte Coproporphyrin and Protoporphyrin in Ethanol- Induced Sideroblastic Erythroporiesis” (Blood [1974]: 291–295). Do the data (see page 16-28) suggest that normal workers and alcoholics with and without sideroblasts differ with respect to mean protoporphyrin level? Use the KW test with a .05 significance level.