We wish to test the hypothesis that music improves learning. Random assignment into two groups, one that listens to music and one that studies in silence, controls for a. the students' inherent academic ability. b. the amount of sleep students had prior to the experiment. c. all of these. d. the students' use of different study strategies.

Read this example of social change in the american society and identify the agent that caused this change. in less than five years almost twenty-five percent of americans had access to the internet a . education b. population c . war and revolution d. science and technology

Read the scenario. samira is a freshman basketball player who hopes to go to college on a basketball scholarship. she is offered the chance to play on her school’s varsity basketball team, which plays in tournaments during holiday breaks. samira usually spends her breaks working at the local hardware store. after careful consideration, samira decides to stay on the freshman basketball team and keep working over breaks. the fact that samira may miss out on a scholarship opportunity by staying on the freshman team illustrates-a cause.-minor consequences.-a trade off.-unexpected risk.

What are the most populous and least areas of russia and why are some areas more heavily populated than others