When developing a science fair project it can be helpful to simply test common assumptions or claims about the cause and effect relationships between common products and our health. For example, do vitamin supplements help you to lose weight, grow longer hair or can they help your vision? Each of these questions and claims can be used for a separate science fair project. This sample science fair project is going to examine the effect that certain vitamin supplements have on your vision.
The hypothesis for this science fair project is that vitamin supplements do not improve your vision. This hypothesis requires a little clarification. For the purposes of this project an improvement in vision will be defined as an increase is visual acuity as measured by a standard chart vision test. The dependent variable for this hypothesis is the visual acuity of the person and the independent variable is the type of vitamin supplement used by the test subject.
To complete this science fair project students will need an eye exam chart, a tape measure, Vitamin C supplements, Vitamin E supplements, Vitamin A supplements and a placebo (sugar pill). The students will also need two to four test subjects for each of four test groups.
The control experiment group for this science fair project will be given a placebo. However, they will first be given a basic eye exam using an eye exam chart that is place ten to fifteen feet away from the test subject. The eye exam will be given for both eyes at the same time. After the eye exam is given the test subjects will be given a placebo supplement that they will take once a day for a month. At the end of the experiment another eye exam will be give.
There will be three test experiment groups. Group A will be given Vitamin A supplements, Group B will be given Vitamin C supplements and Group C will be given Vitamin E supplements. Again each test group will be given an initial eye exam. They will then take their supplements for a month. At the end of the experiment they will each receive another eye exam.
Data Collection and Analysis
The data that will be collected will be the eye exam results. These results will be measured in visual acuity ratios such as 20/15, 20/20 and 20/25. The analysis of the data will involve a simple comparison of the initial and post experiment eye exam results. If an improvement in vision is observed then the test subject will be given a score of 1, if they do not show an improvement then they will be given a score of 0. Each test group will have their scores averaged. The average scores will then be compared to the placebo group to see if the vitamins are helping and to determine which vitamin is helping the most.