Blacks in the North were (free /not free) in the years just before the Civil War. This can be shown by looking at four areas of society: political and judicial rights, social freedoms, education and job opportunities, and religious freedom.

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