What statistical tool should be used for this problem? 1. The Director of St. Michael's Medical Center wanted to find out the number of patients who were diagnosed with HIV in their hospital for the...

What statistical tool should be used for this problem?

1. The Director of St. Michael's Medical Center wanted to find out the number of patients who were diagnosed with HIV in their hospital for the past three years. After then she grouped the data according to the different age group to determine which age group has more cases of HIV infection for the past three years.