Practical Report Concepts

Question 1

Random Error

Answer 1

Random error is caused by any factor that randomly affects the measurement of a variable.

The amount of random error is reflected in the amount of scatter in the data.

An increase in sample size can reduce the effect of random errors in the results.

Measurements can never be done perfectly and therefore random errors can never be eliminated

Question 2

Reliability

Answer 2

Reliability refers to the extent which an experiment yields the same results on repeated trials under the same conditions each time.

Reliability is achieved by minimising the effect of random error.

Question 3

Precision

Answer 3

Precision depends on how well the effect of random errors are minimised.

The effect of random errors can be determined by the degree of scatter in the measured values.

Scatter therefore influences the precision.

Question 4

Accuracy

Answer 4

Accuracy refers to how close the result of the experiment is to the true value.