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Statistics & Probability Science Fair Project

Does Sample Size Matter?

Does Sample Size Matter? | Science Fair Projects | STEM Projects
Have you ever wondered if the number of people you survey affects the accuracy of the results? Let's find out!


The hypothesis is that as the number of participants increase, the results of the survey will be more accurate.

Method & Materials

You will need to obtain permission from 5 different schools to survey 500 students who are 15 years old. You will need to drop a pencil in front of each student and observe which hand they use to catch it.
You will need 500 students age 15, an assistant, 5 copies of permission letters sent to the administration of 5 different schools, and 5 survey forms.


The results showed that as the sample size of the participants increased, the results became more accurate. It was observed that the percentage of left-handers increased as the sample size increased.

Why do this project?

This science project is interesting because it shows how the number of participants can affect the accuracy of the results.

Also Consider

Experiment variations to consider include surveying students to determine the number of students that wear eyeglasses, or who have had their wisdom teeth extracted.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

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