A professor is interested in studying how cramming the night before an exam (also known as massed practice) compares with studying over the course of the week (also known as distributed practice). She instructs her students to study for 3 hours without stopping the night before exam 1. She then instructs them to study for one hour each night for four days prior to exam 2, and compares the exam scores. She finds that students who used distributed practice did significantly better on the exam than when student students used massed practice. 1. What is the confound?
2. How could the confound be fixed?

Which of the following will increase a population's growth rate? read the following scenario and answer the question(s) below. population growth is at the root of many serious environmental problems. from the ancient babylonians thousands of years ago, to thomas malthus two centuries ago, to present day neo-malthusians, humans seem to possess an awareness of earth's limitations in the face of growing populations. today, our ability to accurately quantify and monitor population growth is very sophisticated. we can measure growth and make predictions about world growth with mathematical and computer models. despite long-lasting, rapid global population growth that is only recently starting to show signs of slowing, we have thus far been able to avoid global catastrophe. can we continue to avoid disaster? which of the following will increase a population's growth rate? increased urbanization increased industrialization increased immigration decreased immigration increased emigratio

Did egypt invent wheels or sailboats

Oil is a renewable resource can be used directly from the ground is the least polluting energy source must be removed from the earth using drills