Becky Peterson graduated this month with a degree that paves the way for her to examine patients, prescribe medication and make diagnoses, just like a physician. But she won’t be Dr. Peterson, and her graduate program took just two years. Instead, she is becoming a nurse practitioner, a good-paying job that is also the fastest-growing field in healthcare.  “There is a place for medical-school doctors, and a place for nurse practitioners. And all of us are trying to do the same thing, which is meet the needs of people who need help,” said Peterson, who graduated from a University of…