Remember

Question 1

Validity

Answer 1

Reputable sources

the experiment correctly tests the aim - i.e. all factors are kept constant aside from those being investigated. If in biology, for example, you were testing say the level of enzyme activity with respect to changes in temperature, you obviously wouldn’t do one experiment at 30 degrees and say ph 4 and another at 40 degrees at pH 8; you’d keep everything except temperature constant.

Question 2

Reliability

Answer 2

how consistent the results are. When you repeat an experiment and get the same results, it is reliable.

Question 3

Accurancy

Answer 3

the easiest one, simply how accurate it is. Measuring with a stopwatch that calculates milliseconds is obviously more accurate than one that only calculates up to seconds. A data logger is obviously more accurate than the naked eye.