'The goal of an experimental research study is which of the following? To make an observation to determine the correlation between two variables To make an observation without manipulating any variables To demonstrate the existence of a cause-and-effect relationship between two variables To make an observation to determine the relationship among several variables To accomplish the goal, an experiment must do which of the following? Check all that apply. Control an independent variable Control extraneous variables Manipulate an independent variable Manipulate several variables'
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So, the correct answer for the first part is: $\textbf{To demonstrate the existence of a cause-and-effect relationship between two variables}$ Show more…
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