问题
单项选择题
装饰用木材分为针叶树与阔叶树，下列( )是针叶树。
A．红松、杉木、水曲柳、马尾松
B．蚁木、橡木、甘巴豆、柚木
C．红松、马尾松、杉木、柏树
D．马尾松、落叶松、柞木
答案
参考答案：C
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装饰用木材分为针叶树与阔叶树，下列( )是针叶树。
A．红松、杉木、水曲柳、马尾松
B．蚁木、橡木、甘巴豆、柚木
C．红松、马尾松、杉木、柏树
D．马尾松、落叶松、柞木
参考答案：C
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. |