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【单选题】
In performing a hypothesis test where the null hypothesis is that the population mean is 4.8 against the alternative hypothesis that the population mean is not equal to 4.8, a random sample of 25 items is selected. The sample mean is 4.1 and the sample standard deviation is 1.4. It can be assumed that the population is normally distributed. The level of significance is selected to be 0.10. The table " t " value for this problem is _______.
A.
1.318
B.
1.711
C.
2.492
D.
2.797
E.
3.227
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A.
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B.
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C.
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D.
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B.
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C.
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D.
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dearly
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A.
能承受单向较大的水平推力
B.
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A.
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B.
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C.
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D.
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【简答题】A:How___things? B:Great!
【单选题】拱桥重力式桥墩中的制动墩的作用是
A.
能承受单向较大的水平推力
B.
能承受较大的变形能力
C.
能承受较大的竖直力
D.
能承受较大的弯矩
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A.
正确
B.
错误
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