What sources of data are used by demographer

Some demographic data sources are surveys, samples, census measurements, fieldwork, and observation. When using surveys, demographers research through asking questions to select members of the population. When using samples, demographers look at a small portion of the population as a sample group, then apply statistics to the population overall. Census measurements allow demographers to collect data from all residents of a population. Fieldwork is used to conduct studies and surveys out in the population itself (rather than in isolation). Observation is used to monitor and record the behaviors of a population to understand it better.

did you fail the test? xd

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called