eval:

• RANDOM:

  STRENGTH:

  • potentially unbiased means that confounding variables should be equally divided between the different groups, enhancing internal validity.
• RANDOM

  LIMITATION

  • Difficult and time-consuming to conduct
  • A complete list of the target population may be extremely difficult to obtain
  • May end up with a sample that is still unrepresentative — the laws of probability suggest that random sampling is likely to produce a more representative sample than, say
  • However, it is still possible that the random method may select, for example, 20 female psychology teachers from Lancashire called Joyce