Từ nguyên lý về sự phát triển, Em hãy cho biết trong cuộc sống có nên khép mình trong vòng an toàn không hay cần phá vỡ giới hạn của bản thân để tìm kiếm sự phát triển?

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

What is the cause of their extinction

Within the hierarchy of the federal bureaucracy, the cabinet is higher than independent agencies. higher than the vice president. lower than executive departments. lower than administrators and staff.