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下列关于统计推断的描述，正确的有？
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作单尾检验，查u时，需将双尾概率乘以2再查表。
假设检验时，如果第二类错误发生，则其概率是大于显著性水平的。
假设检验时，计算出的概率，是指获得实得样本的概率
Translate the following paragraph into Chinese.MOOCs are classes that are taught online to large numbers of students, with minimal involvement of professors. Typically, students watch short video lectures and complete assignments that are graded either by machines or by other students. That way a single professor can support a class with thousands of participants. Today the number of high-profile research institutions that present these courses has steadily risen. As college students continue to opt for more modern and flexible means of education, there is room for MOOCs to make major waves in the world of higher education. However, MOOCs aren’t a substitute for undergraduate education. The issue is that not many employers view the online courses as having the same amount of applicable information as an in-person class. In short, MOOCs are still viewed as courses for fun instead of real applicable learning.
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