Completion requirements
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Use this online tool to calculate your sample size (how many people you need to poll or survey in order to get accurate results). If it's a question that applies to the whole school, you would enter the total enrollment of the school. If it only applies to juniors, you would enter the number of students in the junior class. For confidence level enter 95% and for margin of error enter 5%. Then calculate and you'll know how many respondents you need to gather reliable data.
Click on How many people should I ask? to open the resource.