问题
单项选择题
John McHenry is a junior consultant working in Oldie Village Pension Consulting. He has calculated annual returns for 300 portfolio managers, and is analyzing the relationship between fees and performance. The dataset he is using (returns and fees for each manager) is an example of:
A．
| A. a stratified random sample. |
B．
| B. a normalized dataset. |
C．
| C. a cross-sectional dataset. |
答案
参考答案：C
解析：A time-series sample consists of observations taken over a period of time at specific and equally spaced time intervals. Cross-sectional data are a sample of observations taken at a single point in time.
