Final answer:
The evaluation of the nursing unit's central line site infection rate is considered favorable or good because it is well below the expected standard. The implementation of the new protocol has resulted in a lower infection rate.
Step-by-step explanation:
The evaluation of the nursing unit's central line site infection rate is considered favorable or good. This is because the infection rate of 3% is well below the agency's expected standard of 5%. The implementation of the new protocol has resulted in a lower infection rate, indicating that the protocol is effective in preventing central line site infections.