在单因子方差分析中,因子A有4个水平,每个水平下各重复试验5次,则误差平方和的自由度为()。
A. 3
B. 4
C. 16
D. 20
If you are not happy with what you have got now, what makes you think that you will be happier with ______
A. anything
B. some
C. more
D. less
The government has provided the capital library with heavy ______ to keep it one of the largest in the world.
A. subscriptions B. tips C. subsidies D. bonuses
Mary was a late ______ and hated getting up before noon.
A. sleep
B. sleeping
C. sleeper
D. sleepy