The number of students participating in a survey to achieve a target margin of error depends on the sample size required to obtain the desired accuracy. The larger the sample size, the smaller the margin of error. As a rule of thumb, for surveys with a 95% confidence level, the number of students should be at least 400 for a margin of error of about 5%.
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In statistics, Slovin’s Formula is used to calculate the minimum sample sized needed to estimate a statistic based on an acceptable margin of error.
Slovin’s formula is calculated as:
n = N / (1 + Ne2)
where:
- n = sample size
- N = population size
- e = acceptable margin of error
To use Slovin’s formula, simply enter the population size and acceptable margin of error below and then click the “Calculate” button:
Population Size (N):
Acceptable Margin of Error (e):
Sample size (n): 200.000
function calc() {
//get input data
var N= +document.getElementById(‘N’).value;
var e = +document.getElementById(‘e’).value;
var n = N/(1 -(-1*N*e*e))
//output results
document.getElementById(‘n’).innerHTML = n.toFixed(3);
} //end calc function