In some types of research the target population might be as broad as all humans, but in other types of research the target population might be a smaller group such as teenagers, pre-school children or people who misuse drugs. We call the group that we are interested in studying our 'target population'. In psychological research we are interested in learning about large groups of people who all have something in common. This limits how much the findings of the study can be generalised to the whole population. For instance if only males are selected, or if the advert for volunteers is put into the Guardian, only people who read the Guardian are selected. Biased sample iswWhen certain groups are over or under represented within the sample selected.This can only occur if the sample of participants is representative of the population. Generalisability refers to the extent to which we can apply the findings of our research to the target population we are interested in.The people who take part are referred to as “participants”. A sample is the group of people who take part in the investigation.The target population is the total group of individuals from which the sample might be drawn.Sampling is the process of selecting a representative group from the population under study.
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