Hematology tests on workers. The accompanying table (saved in the LYMPHO file) lists the lymphocyte count results

Question:

Hematology tests on workers. The accompanying table (saved in the LYMPHO file) lists the lymphocyte count results from hematology tests administered to a sample of 50 West Indian or African workers. Test (at Î± = .05) the hypothesis that the median lymphocyte count of all West Indian or African workers exceeds 20.