In an experiment to test a new drug's effectiveness, one group is given a larger dosage than is typically prescribed, and a second group is given a smaller dosage than is typically prescribed. Then, the results of the groups are compared to each other.What is missing that would improve this scientific design? a control group a second independent variable a dependent variable an independent variable

## Step 1<br />In a scientific experiment, the goal is to test the effectiveness of a new drug. The experiment involves two groups, one receiving a larger dosage than typically prescribed and the other receiving a smaller dosage. The results of these two groups are then compared.<br /><br />## Step 2<br />However, the experiment lacks a control group. A control group is a group in an experiment that does not receive the experimental treatment and is used as a benchmark to measure how the other tested subjects do.<br /><br />## Step 3<br />In this experiment, the control group would be a group of subjects who do not receive any dosage of the drug. This group would serve as a benchmark to compare the effects of the drug on the other two groups.<br /><br />## Step 4<br />By comparing the results of the experimental groups with the control group, the experiment can determine the effectiveness of the drug.