The head of the psychology department in a university is interested in finding the attitudes of her students toward implementing an internship as a requirement for completion of the degree. she obtains a list of all students who are psychology majors, randomly selects 100 students from the list, and surveys those who are selected. what type of sampling technique has she employed?

                                                        water

a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

                                                        halon  

any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, but now known to damage the ozone layer.

                                                  dry chemical

extinguishing agent used on class a, class b, and class c fires.

                                                  carbon dioxide

a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. it is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

answer the questions honestly.