Question

How can internal and external validity be increased in an experiment?

Answer 1

Internal validity is defined as the degree to which the results are attributable to the independent variable and not some other factors.

- whether the effects observed in the experiment are due to manipulation of independent variable and not some other factors.

Internal validity can be improved by

- by controlling externeous variables,

- using standerdised instructions and instrumentation

- by testing the hypothesis and principles of study ,

- eliminating demand characteristics.

External validity is defined as the extent to which the results of the study can be Generalised to other settings,to other people and over time.

External validity can be improved by -

- setting experiments in a more natural setting

- sampling to be randomised sampling and to be done from general population.