A researcher is interested in investigating the effect of different types of music on people's productivity. They recruit participants and assign them to three groups: Group 1 listens to classical music, Group 2 listens to electronic music, and Group 3 listens to no music. Each group is given a set of tasks to complete, and their productivity is measured by the number of tasks completed within a specific time frame. Dependent Variable: ____ Independent Variable: ____ Control Variables (alphabetical order): - ____ - ____ - ____

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