Answer:
1.06
Step-by-step explanation:
The margin of error can be calculated using the following equation:
![\text{margin of error = z}\frac{s}{\sqrt[]{n}}](https://img.qammunity.org/2023/formulas/mathematics/college/33fyx4mm7wk90un0xpq1atzyl7jsa8mnnt.png)
Where z is related to the 95% confidence interval. For 95%, z = 1.96
Then, replacing the values, we get:
![\text{margin of error = 1.96}\cdot\frac{3}{\sqrt[]{31}}=1.06](https://img.qammunity.org/2023/formulas/mathematics/college/8vpci6cxl5n7m281werpj20tdleo947xu6.png)
Therefore, the margin of error is 1.06