Question

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Explanation:

Identify the experimental setup

The text describes an experiment: "Mosquito repellent is sprayed on one arm and the other arm is not sprayed. The number of mosquito bites is counted after 2 hours." This setup is designed to test the effectiveness of mosquito repellent using Experimental Variables and Scientific Controls.

Determine the independent variable

The independent variable is the factor manipulated by the researcher. Here, it is whether or not mosquito repellent is applied (sprayed vs. unsprayed arm).

Determine the dependent variable

The Dependent Variable is the factor being measured or observed. In this experiment, it is the number of mosquito bites counted on each arm after 2 hours.

Identify the scientific control

The arm that is not sprayed serves as the Scientific Controls (specifically, a negative control) to establish a baseline for how many bites occur without repellent.

Answer:

Based on the experimental setup described:

• Independent Variable: Application of mosquito repellent (sprayed vs. unsprayed arm).
• Dependent Variable: The number of mosquito bites counted after 2 hours.
• Control Group: The arm that is not sprayed with repellent.