1.23 Medical students. Students who have finished medical school are assigned to residencies in hospitals to receive further training in a medical specialty. Here is part of a hypothetical database of students seeking residency positions. USMLE is the student's score on Step 1 of the national medical licensing examination. Specialty Name Medical School Sex Age USMLE Sought Abrams, Florida F 28 238 Family Laurie medicine Brown, Meharry M 25 205 Radiology Gordon Cabrera, Tufts F 26 191 Pediatrics Maria Ismael, Indiana F 32 Miranda 245 Internal medicine (a) What individuals does this data set describe? (b) In addition to the student's name, how many vari- ables does the data set contain? Which of these vari-