At Rampart General Hospital, the average length of stay in the hospital for all patients is 4.5 days. When a sample of 30 patients from the population of Rampart General Hospital patients is surveyed, it is found that the average length of stay for the sample is 3.5 days. We call the number 4.5 a ____________ and the number 3.5 a _______________.

Group of answer choices

1. parameter; statistic

2. measure of center; measure of variability

3. parameter; parameter

4. statistic; statistic

5. statistic; parameter