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【单选题】
数据a 1 ，a 2 ，a 3 ，…，a n 的方差为A，则数据2a 1 ，2a 2 ，2a 3 ，…，2a n 的方差为（ ）A.
A/2
B.
A
C.
2A
D.
4A
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举一反三
【简答题】简述订单驱动与报价驱动两种场内交易系统的特点。
【简答题】简述订单驱动与报价驱动两种场内交易系统的特点。
【单选题】Madonna buys only two goods. Her utility function is Cobb-Douglas. Her demand functions have which of the following properties?
A.
Her demand for one of the two goods does not depend on income.
B.
Her demand for neither good depends on income.
C.
Her demand for each of the two goods depends only on her income and on the price of that good itself.
D.
Her demand for each of the goods depends on income and on the prices of both goods.
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