Answer: alternative D.
Explanation: Dr. DeVries should choose his sample population randomly in order for his research to be representative, even having a specific population, which is high school seniors, that he wants to study. By <u>choosing specifically students from an exclusive college preparatory school, he isn't considering how students from other schools might perform in his research test</u>. This would be a very important step for him to understand how the practice in problem solving affects the ability related to it. Otherwise, he will have a distorted result.
Answer:
c. Under Original Medicare, there is a single deductible amount due for the first 60 days of any inpatient hospital stay, after which it converts into a per-day amount through day 90. After day 90, he would pay a daily amount up to 60 days over his lifetime, after which he would be responsible for all costs.
