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It depends on what to measure.
Standard deviation is a statistical measure. It may be used in psychology but is not restricted to that subject. It is a measure of the spread of the distribution of values of some attribute that is being measured.
A protractor is used to measure angles.When surveying a theodolite is used.There are a number of tools on the market that perform angle measurement.
A protractor can help you do this. It has a bar that swings and can measure certain angles.
Error bars are often used on graphs to show statistical comparisons.