Allahmere
24.02.2020 •
Social Studies
Determine whether the study described is a randomized experiment or an observational study. A math department chair wants to determine the effectiveness of online homework systems. She selects four college algebra classes where each one is set up to use a different online homework system. Students have already enrolled in the classes. She administers a common pretest and final exam to measure the effectiveness.
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Ответ:
observational study, she is in control of all of the variables.
Explanation:
Ответ:
~kinetic ~potential
explanation:
kinetic and potential energies would be types of mechanical energies.