1. No, there is no control group present in this experiment because there is no test group that does not receive the independent variable. In this case, the independent variable is the number of drops of water and it is being tested on the "Lincoln" side of the penny.
2. Without the actual bar graph provided in the question, it is not possible to determine if the average number of drops for each group is about the same. However, reasons why the actual number of drops for each group may be similar or dissimilar could include the consistency in drop size, the angle at which the penny is held, the temperature of the water, or the cleanliness of the penny.
3. The results of this experiment may be considered valid if it adheres to the principles of a valid experimental procedure. This would include clear documentation of the variables being tested, consistent and controlled conditions, and accurate measurement and recording of data.
4. If the other side of the penny was used, the results of the experiment would not be comparable to the rest of the class because the "Lincoln" side of the penny was the focus of the experiment. Using the same side of the penny ensures consistency and allows for accurate comparison and analysis of data among all participants.
PURPOSE: In this activity, you will practice graphing the results of an experiment. You will also learn what constitutes a valid experimental procedure.
PROBLEM: How many drops of water will fit onto the “Lincoln” side of a penny? A control variable is a test group that does not receive the independent variable.
1. Based on this experiment, is there a control group present? If so, what is it?
Validity is a measure of how correct the results of an experiment are. Think about what makes an experiment valid.
2. Using your bar graph, determine if the average number of drops for each group is about the 3. same. List four reasons why the actual number of drops for each group was similar or dissimilar.
3. Are the results of this experiment “valid”? Why or why not?
4. What would happen if you used the other side of the penny? When comparing data with the rest of the class, why would it be important that we all use the same “Lincoln” side of the penny?
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