3.A researcher is interested in the effects listening to rap music has on the language development of American children. To examine this, 100 children are randomly selected from the Bellevue area and randomly assigned to one of two groups. Children in Group 1 are exposed to excessive amounts of rap during their first 3 years of life. Children in Group 2 are not exposed to rap. The number of words in each child's vocabulary at the end of the study (i.e., at the age of 3) is then recorded.

What is the independent variable in this study? What is the dependent variable in this study? What is the sample in this study? What is the population in this study? If the results are significant, can the researcher conclude that the IV caused the change in the DV? Why or why not?

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