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will be sleeping have slept have been sleeping will sleep
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若"拒绝Ho"，犯错误的可能性为" 拒绝了实际成立的Ho所犯的错误为I型错误 对同一资料，I型错误与Ⅱ型错误的概率大小没有联系 若想同时减小I型错误与Ⅱ型错误的概率，只有减少样本含量n 若"不拒绝厅Ho"，不可能犯Ⅱ型错误
will be sleeping have slept have been sleeping will sleep
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Most people need less sleep when they grow older. Most people need seven and a half hours of sleep every night. On average, people in the U.S. today sleep less per night than they used to. For most people, less than six hours of sleep on a typical work night is enoug
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get down break down calm down put down
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was given would be given should give should be given
will be sleeping have slept have been sleeping will sleep
will be sleeping have slept have been sleeping will sleep
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