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【单选题】
Suppose that your data include 4000 observations, and you must choose the number of intervals to represent in your histogram. What does Sturges' rule recommend?( 公式也可以写为m=1 + Log2 (N))A.
Since 12 is the base 2 logarithm of 4096 (which is close to 4000), we should choose 12 intervals.
B.
The base 2 logarithm of 4096 (which is close to 4000) is 13, so Sturges' rule recommends 13 + 1 or 14 intervals.
C.
The base 2 logarithm of 4096 (which is close to 4000) is 12, so Sturges' rule recommends 12 - 1 or eleven intervals.
D.
According to Sturges' rule, there should be 13 intervals because the base 2 logarithm of 4096 (which is close to 4000) is 12
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【单选题】Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
A.
before
B.
as
C.
unless
D.
in case
【简答题】Diamonds which are too flawed to be cut are usually used for ______.
【单选题】从选项中选出正确的句子翻译 Unluckily, rainforests all over the world are being cut for wood.
A.
不幸地是，世界各地雨林早已被砍伐用作木材
B.
不幸地是，世界各地雨林常常被砍伐用作木材
C.
不幸地是，世界各地雨林正在被砍伐用作木材。
【简答题】More and more trees are being cut down, and it’s time for us to stop this crime ____nature.
【单选题】Trees are cut down merely for fuel and wildlife is killed simply for food. It is time to ____ a
A.
111. Trees are cut down merely for fuel and wildlife is killed simply for food. It is time to ____ an end to waste. A．call off
B.
call for
C.
call in
D.
call on
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