Four-year-old larry squeezes between his mommy and daddy as they sit together on the couch. he cuddles with mommy and pushes daddy away. this illustrates which freudian concept?

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling