Uestion 8 a recent national study revealed that approximately percent of u. s. 15-year-olds met the federal government's exercise recommendations (a minimum of 60 minutes of moderate to vigorous exercise per day).

The primary purpose of a certificate of confidentiality is to: allow law enforcement to investigate abuse cases.protect researchers from disclosing conflicts of interest.prevent subjects from knowing the purpose of a study.protect identifiable research information from compelled disclosure.

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

Alexander hamilton was one of the most important of the founding fathers. which of the following is he responsible for? select all that apply.