A researcher initiates a study to determine whether playing organized sports helps children with anxiety feel less anxious. This study can best be classified as research.

applied

Explanation: Applied research is a methodology employed to find solution to a specific practical issue that is affecting an individual or group of people. However, Applied research is a method of scientific study and research that is used in business, medicine, and education in order to seek for solutions that may improve health, solve scientific problems or develop new technology.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.