题目内容

当力与刚体转轴平行时，可以对刚体的转轴产生力矩。

A. 对
B. 错

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刚体转动的角速度很大，那么刚体受到的力矩也很大。

A. 对
B. 错

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Which of the following is a statistic that can be used to test hypotheses about a single population parameter?

A. F statistic
B. t statistic
C. χ2 statistic
Durbin Watson statistic

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Which of the following tools is used to test multiple linear restrictions?

A. t test
B. z test
C. F test
D. Unit root test

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The formula for the standard error of the regression coefficient, when moving from one explanatory variable to two explanatory variables,

A. stays the same.
B. changes, unless the second explanatory variable is a binary variable.
C. changes.
D. changes, unless you test for a null hypothesis that the addition regression coefficient is zero.

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当力与刚体转轴平行时，可以对刚体的转轴产生力矩。

A. 对 B. 错

刚体转动的角速度很大，那么刚体受到的力矩也很大。

Which of the following is a statistic that can be used to test hypotheses about a single population parameter?

Which of the following tools is used to test multiple linear restrictions?

The formula for the standard error of the regression coefficient, when moving from one explanatory variable to two explanatory variables,

A. 对
B. 错