Question

which of the following best specifies the purpose of error bars on a graph?
to show the mean of a data set
to identify the independent variable
to give a visual display of measurement precision
to indicate the total number of measurements that are made

Explanation:

Error bars represent the variability or uncertainty in data. They visually show the precision of measurements by indicating the range within which the true value is likely to lie.

Answer:

to give a visual display of measurement precision