Identify the sampling technique used (random, cluster, stratified, convenience, systematic):

A researcher randomly selects and interviews fifty male and fifty female teachers. * Your answer Based on 12,500 responses from 42,000 surveys sent to its alumni. a major university estimated that the annual salary of its alumni was 92,500. * Your answer At a local community College, five math classes are randomly selected out of 20and all of the students from each class are interviewed. * Your