According to Marx's theory, the difference between the value of a raw material and the actual product is called

To study career aspirations among high school students in Alabama, a researcher randomly selects 5% of the state's school districts and gives all the students in each district a survey designed to measure career goals

What sampling procedure is being used here? a. quota b. stratified c. cluster d. EPSEM

For his senior thesis, Jacob is studying the development of motor coordination in monkeys from birth to old age, but only has one semester to collect his data. What kind of descriptive research design should he use?

a. longitudinal b. experimental c. cross sectional d. historical