Accuracy and Precision

Question 1

This refers to the degree of conformity and correctness of something when compared to a true or absolute value.

Answer 1

Accuracy

Question 2

Refers to the closeness of two measurements to each other

Answer 2

Precision

Question 3

A type of measurement error caused by the natural variability in the measurement process.

Answer 3

Random Error

Question 4

What are the sources of random errors?

Answer 4

▪ natural variations in real world contexts.
▪ imprecise measurement instruments.
▪ differences between participants.
▪ poorly controlled experimental procedures.

Question 5

How do you reduce random errors?

Answer 5

▪ Take Repeated measurements.
▪ Increase the sample size.
▪ Increase the precision of measuring instruments.
▪ Control other variables..

Question 6

These are consistent inaccuracies in the
result of an experiment that may be incurred due to the equipment itself or the flaw in the experimental procedures.

Answer 6

Systematic Error

Question 7

Occurs when a scale
isn’t calibrated to a
correct zero point.
It’s also called an
additive error or a
zero-setting error.

Answer 7

Offset Error

Question 8

Occurs when measurements consistently differ from the true value proportionally.

Answer 8

Scale Factor Error

Question 9

What are the sources of Systematic Error?

Answer 9

▪ Responsive Bias
▪ Experimenter Drift
▪ Sampling Bias

Question 10

How do you reduce Systematic Error?

Answer 10

▪ Triangulation
▪ Regular Calibration
▪ Randomization
▪ Masking