Dr. Phillips is a cognitive-developmental psychologist who studies how children learn mathematical principles. His current inter
est is in studying how children learn multiplication. He recruits 54 second graders who have not yet learned how to multiply numbers to participate in his study. He wonders if different teaching styles lead to different levels of mastery of the subject. Condition 1 involves having students watch a video of cartoon characters explaining multiplication. Condition 2 involves having students being taught multiplication by a teacher. Condition 3 involves students being taught multiplication by a fourth grader. In all conditions, participants are given instruction for the same amount of time, and then are given the same 15-question multiplication test. The number of questions answered correctly is recorded. How many levels does the IV have?_________
Is the IV measured or manipulated? _________
Use the exact words from the description above to answer: how is the DV operationalized? ______________
Answer:The accomplishments of the Lewis and Clark Expedition were extensive. It altered the imperial struggle for the control of North America, particularity in the Pacific Northwest. It strengthened the U.S. claim to the areas now known as the states of Oregon and Washington.
