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【单选题】
某职业病防治院测定了年龄相近的45名男性用力肺活量,其中石棉肺患者、石棉肺可疑患者和正常人各15名,其用力肺活量分别为(1.79±0.74)L、(2.31±0.87)L和(3.08±0.65)L,拟推断石棉肺患者、石棉肺可疑患者和正常人的用力肺活量是否不同,宜采用的假设检验的方法是:A.
两组均数比较的t检验
B.
方差检验
C.
完全随机设计方差分析
D.
随机区组方差分析
E.
析因设计方差分析
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举一反三
【判断题】If consumers were originally willing to buy 500 units of a good at a price of $20 are now willing to buy 500 units of the same good at a price of $10, that change would be described as a decrease in d...
A.
正确
B.
错误
【单选题】If at a price of $10, quantity bought will be 5400 per day, and at $15, quantity bought will be 4600 per day, then the price elasticity of demand is approximately:
A.
0.2.
B.
0.4.
C.
0.6.
D.
2.5.
E.
6.0.
【简答题】请简述专利申请的基本条件。
【单选题】If at a price of $10, quantity bought will be 5400 per day, and at $15, quantity bought will be 4600 per day, then the price elasticity of demand is approximately:
A.
0.2
B.
0.4
C.
0.6
D.
2.5
【单选题】Pedro buys market basket A that includes 10 books at a price of $20 per book and 10 DVDs at a price of $10 per DVD. Market basket B contains 12 books and 12 DVDs. Based on this information, which of...
A.
Revealed preference analysis implies that Pedro only prefers basket B to basket A if basket A is more expensive.
B.
Pedro prefers market basket B to basket
C.
Market basket B will cost more than basket
D.
If the prices change and Pedro chooses market basket C, which now costs the same as basket B, then basket C is prefer to basket
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