Carmen conducted an experiment to determine if listening to different types of music would affect a person's pulse. Her hypothosis was that pulso rate would change with different types of music. Each person listened to seven different selections of music for 300 seconds each Each person's pulse was taken before the music and then after each 30-second interval of music. The pulses were taken again after the music soloctions were completed. Based on her exportment, Carmen concluded that a porson's pulso rate changod whon the porson listened to different types of music. Which component is missing from Carmen's experiment? a question a control group a description of the experment

## Step 1<br />In a scientific experiment, there are several key components that are necessary to ensure the validity and reliability of the results. These components include:<br />- A question: This is the problem that the experiment is trying to solve.<br />- A hypothesis: This is a proposed explanation for the problem.<br />- A control group: This is a group that is used as a comparison to the experimental group.<br />- A description of the experiment: This includes the procedures and methods used in the experiment.<br />- A control group: This is a group that is used as a comparison to the experimental group.<br /><br />## Step 2<br />In Carmen's experiment, she has a question (does listening to different types of music affect a person's pulse rate?), a hypothesis (a person's pulse rate changes with different types of music), and a description of the experiment (each person listened to seven different selections of music for 300 seconds each, and their pulse was taken before the music and then after each 30-second interval of music).<br /><br />## Step 3<br />However, Carmen's experiment lacks a control group. A control group is a group that is used as a comparison to the experimental group. In this case, the control group would be a group of people who did not listen to any music while their pulse rate was measured. This group would provide a baseline for comparison with the experimental group (the group that listened to different types of music).