The margin of error is approximately
[tex]\pm\frac{1}{\sqrt[]{n}}[/tex]
where n is the size of the sample.
2020 adults were sampled, thus n = 2020:
Thus, the sample has an error of:
[tex]\pm\frac{1}{\sqrt[]{2020}}=\pm0.02224970797449923946989914895593[/tex]
Expressing in %.
Margin of error = 2.22%
