What did the dow and jones company create

In a citizens elect the president as head of government separate loy from the legislature

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

This is a crossword assignment for psychology 8 letter word a benefit of observational research is that it often generates