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【简答题】
分层抽样的优点是|单纯随机抽样的优点是|整群抽样的优点是|系统抽样的优点是 A. 简单、直观、标准误易计算 B. 按比例分配样本，简便易行 C. 便于组织，节约经费，易于控制调查质量 D. 对各层可采用不同的抽样方法，抽样误差小 E. 对所有观察对象进行调查，全面完整
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【单选题】You notice that the price of orange juice at your local grocery store has increased. Which of the following statements is not a possible explanation for the rise in the price of orange juice?
A.
Frosty weather destroys oranges causing the price of oranges to increase.
B.
As a result of an increase in income, consumers wish to purchase more orange juice at every price level.
C.
A recent scientific study is reported in the press that suggests that apple juice may be contaminated with pesticides.
D.
Due to the bioengineering of orange trees, the domestic supply of oranges increases.
【单选题】Suppose the price of a Big Mac in New York is $3.00 and the price of a Big Mac in Paris is equivalent to $3.75 at the prevailing euro/dollar exchange rate. Using the concept of purchasing power parity...
A.
undervalued by 25 percent against the dollar.
B.
overvalued by 25 percent against the dollar.
C.
appreciating relative to the dollar.
D.
depreciating relative to the dollar.
【简答题】作图示结构固定端竖向反力 F A 的影响线。
【单选题】Alison is a traveling salesperson who drives many miles each day to visit her clients. She gets utility from the purchase of gasoline, but she doesn't care which brand of gasoline she consumes. Suppos...
A.
. 40 gallons at PB and 30 gallons at Noxxe
B.
. none at PB and 30 gallons at Noxxe
C.
. 20 gallons at PB and 15 gallons at Noxxe
D.
. 40 gallons at PB and none at Noxxe
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