In order to test the effectiveness of a new vaccine, 50 volunteers are selected and divided into two groups. one group is the control group and the other is the experimental group. both groups are given a pill to take that is identical in size, shape, color and texture.
based on the experiment scenario:
1. describe the control group.
2. describe the experimental group.
3. what variable is kept constant?
4. what variables are being changed?
answer in at least 4 complete sentences.

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !