Question

Experimental and observation method of data collection in survey in reserach

Answer 1

A census is a survey of a whole population. For example, the U.S. Census. Censuses can be very expensive and time-consuming, if the population is large.A sample survey takes a fraction of the population. Sample surveys are cheaper than censuses, but are not as accurate. Bias can also be an issue.An experiment is a controlled study of a group. Experiments are very common in the medical fields. The researcher controls how members are placed study groups and which treatment each group receives. Bias can be a major issue with experiments.An observational study is about the same as an experiment. However, the researcher does not use control groups or assign treatments.