In a research study of the effects of marijuana on memory, researchers divided subjects into three groups: subjects in the first group were given “one joint” to smoke, subjects in the second group were given “two joints” to smoke, and subjects in the third group were given no marijuana at all. The participants all studied lists of words and later were given a test to determine how many words they remembered.
1. In this study, what is the independent variable? (1 pt)
2. In this study, what is the dependent variable? (1 pt)
3. In this study, what were the levels of the independent variable? (1 pt)
4. What is the name given to the group which was given no marijuana at all? (1 pt)
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