Which requirement is a written qualification for president of the united states?
a) the candidate must be a political party member.
b) the candidate must be a native-born american citzen.
c) the candidate must have college or university degree.
d) the candidate must have previous political experience.

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