In statistics, a population is the group on which information is being gathered and analyzed. A sample is a representative selection of the population.

Nationwide population sample survey launched; Xi extends greetings to elderly on eve of China's Seniors' Day; Jiangsu steps up efforts on affordable, reliable childcare ...

Two Sample Proportion z-Test Calculator This web calculator conducts a z-test for the difference between two populations' proportions. The calculator includes a video definition, an explanation of the ...

The National Bureau of Statistics said on Tuesday that it will launch a nationwide population sample survey this year, in order to accurately and promptly monitor demographic development in China ...