Eric has maintained contact with six of his high school friends for the last 60 years. They often get together for activities, to socialize, and to simply spend time together. Eric and his longtime friends would be BEST described as a(n): Group of answer choices zone of minimal comfort. zone of maximal performance potential. social convoy.

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