A Public Security Bureau wants to conduct a survey to determine what percentage of police
A、Cluster
B、Convenience
C、Simple random
D、Stratified random
A、Cluster
B、Convenience
C、Simple random
D、Stratified random
A、Yes.
B、No.
C、Not given
D、Not clear.
A、( A, B )
B、( A, C )
C、( B, D )
D、( B, C)
#include
using namespace std;
class A{
int a
public:
A():a(9){}
virtual void print() const {cout<};
class B:public A{
char b;
public:
B(){b= ‘S’;}
void print()const{cout<};
void show(Aa&X){X,print()}
int main()
{ Ad1;*p;
Bd2;
p=&d2;
d1,print();
d2,print();
p->print();
show(d1);
show(d2);
return 0;}
A、independent but not mutually exclusive (独立但不互斥)
B、mutually exclusive but not independent
C、mutually exclusive and independent
D、neither mutually exclusive nor independent
A、quantitative and continuous
B、quantitative and discrete
C、categorical and quantitative
D、categorical and continuous
A、I only
B、II only
C、III only
D、II and III
A、Normal distribution
B、t-distribution
C、F distribution
D、binomial distribution
Which of the following best describes the shape of the histogram at the above?
A、approximately normal
B、skewed left
C、skewed right
D、symmetric
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