Question

group a
trial 1: 11.1 ml, trial 2: 12.4 ml, trial 3: 21.0 ml, trial 4: 16.0 ml (partially visible)
group b:
trial 1: 16.8 ml, trial 2: 17.3 ml, trial 3: 17.0 ml, trial 4: 17.2 ml

1. which group’s data is more precise? why?

Explanation:

Precision refers to how close measured values are to each other. Group A's data (11.1 mL, 12.4 mL, 21.0 mL, 16.0 mL) has a wider range of values with larger differences between them. Group B's data (16.8 mL, 17.3 mL, 17.0 mL, 17.2 mL) has values that are much closer together, showing less variation. So Group B's data is more precise as its measurements are more consistent.

Answer:

Group B's data is more precise.