According to census 2000 what happened to the asian population in the united states between 1990 and 2000?
a) it increased
b) it decreased
c) it remained the same

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