Boyd takes additional measurements of the mass of product formed in a reaction. he uses a balance that has smaller graduations than the first balance he used.
what is boyd most likely trying to change?
he is trying to increase his accuracy but not his precision.
he is trying to increase his precision but not his accuracy.
he is trying to decrease his precision and increase his accuracy.
he is trying to increase his precision and decrease his accuracy.

The right answer is A.

Accuracy is "Narrow agreement between the value found and the accepted value either as a conventionally true value or as a reference value"

The precision (or fidelity) is "Close agreement between a series of measurements obtained under defined conditions from multiple samples taken from the same homogeneous sample"

Based on these definitions, Boyd tried to improve the accuracy by changing scales, that is, he tries to find a result that matches the true value.