Other scientists probably could not replicate an experiment if a) the data was accurate b) the procedure was clear c) the observations were recorded a week later d) the measuring device used was accurate e) all of the above f) none of the above

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