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【简答题】
为调查某 5443 户城镇居民服装消费情况,采用简单随机不重复抽样调查了 36 户进行调查,得到平均消费支出 800 元, 试根据此估计: ( 1 )该地区居民服装消费支出总额,并给出置信水平为 95% 的置信区间。 ( 2 )如果希望服装平均消费支出的相对误差限不超过 5% ,则样本量至少应为多少?
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举一反三
【单选题】SQ3R A Proven method for effective textbook reading is the SQ3R method developed by Francis Robinson. The first step is to survey (the S step) the chapter by reading the title, introduction, section h...
A.
needs to be proven
B.
leaves much to be desired
C.
turns out to be practicable
D.
cannot be used by every reader
【单选题】下面的代码中,可以实现翻转数组操作的是()
A.
#include using namespace std； int main() { int a[10] = {1,2,3,4,5,6,7,8,9,10}; int begin = 0,end = 9; int tmp; while(begin < end) { tmp=a[begin]; a[begin]=a[end]; a[end]=tmp; begin++; end--; } for(int i=0;i < 10;i++) { cout << a[i] << ' ' ; } cout << endl; return 0; }
B.
#include using namespace std; int main() { int a[10] = {1,2,3,4,5,6,7,8,9,10}; int begin = 0,end = 9; int tmp; while(begin < end) { tmp=a[begin]; a[begin]=a[end]; a[end]=tmp; } for(int i=0;i < 10;i++) { cout << a[i] << ' ' ; } cout << endl; return 0; }
C.
#include using namespace std; int main() { int a[10] = {1,2,3,4,5,6,7,8,9,10}; int begin = 0,end = 9; while(begin < end) { a[begin]=a[end]; a[end]=a[begin]; } for(int i=0;i < 10;i++) { cout << a[i] << ' ' ; } cout << endl; return 0; }
D.
#include using namespace std; int main() { int a[10] = {1,2,3,4,5,6,7,8,9,10}; int begin = 0,end = 10; int tmp; while(begin < end) { tmp=a[begin]; a[begin]=a[end]; a[end]=tmp; begin++; end--; } for(int i=0;i < 10;i++) { cout << a[i] << ' ' ; } cout << endl; return 0; }
【单选题】A proven method for effective textbook reading is the SQ3R method developed by Francis Robinson. The first step is to survey (the S step) the chapter by reading the title, introduction, section headin...
A.
needs to be proven
B.
leaves much to he desired
C.
turns out to be practicable
D.
cannot be used by every reader
【简答题】______ is a method of rapidly moving the eyes over a text with the purpose of getting the main idea or a general overview of its content. 2. It can help you get the ______, the ______ of the reading m...
【简答题】A proven method for effective textbook reading is the SQ3R method developed by Francis Robinson. The first is to survey (the S step) the chapter by reading the title, introduction, section headings, s...
【判断题】100ms 积算定时器( T250 ~ T255 )共 6 点,是对 100ms 时钟脉冲进行累积计数的定时的时间范围为 0.1 ~ 3276.7s 。
A.
正确
B.
错误
【单选题】在MSR路由器上，ping命令的-t参数指定ICMPEchoReply报文的超时时间，取值范围为1～65535，单位为毫秒，它的默认值为（）毫秒。
A.
200
B.
100
C.
2000
D.
1000
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