Core Studies - Sample Recruitment Methods

Self-selected

Advertisements in newspapers and direct mailshots asking for participants matching the sample description. 

Restricted Sample 

A restricted sample is good in this situation because he can compare to the German Army which is what he was wanting to do.

A restricted sample is bad in this situation because he can't generalise to the outside population/those who don't fit the sample description. 

Self-selected

Advertised via flyers in the canteens around the university

Unrepresentative 

It's an unrepresentative sample as all the students from Amsterdam

Opportunity Sample

It is an opportunity sample because they used the people who happened to be on a subway.

Opportunity Sample

People who happened to be in the city at the time of the experiment 

Opportunity Sample

It was an opportunity sample of their own students at the university. 

Opportunity Sample

8 experimenters brought along 5 of their friends/acquaintances 

Opportunity Sample

It was an opportunity sample made up of students and researches at the university

Self-selected Sample

Students who volunteered some of which received a large chocolate bar for taking part in the study

Opportunity Sample

Children who were at the nursery in Stamford University

Random Sample

Looked into doctor's surgery's details of children who had asthma in Australia and contacted some to take part in the study

No sample method stated

Opportunity Sample

Sample selected from the schools which allowed them access to their pupils

Opportunity

People he knew that had undergone the corpus callosum procedure.

Opportunity

Selected from those who had done the marshmallow study.

Opportunity?

2 kittens selected.

Self-selected

Experimental group of taxi drivers.

Opportunity

Matched males who had previously had a brain scan at that hospital.

Self-selected

Father was a Freudian supporter and volunteered his son.

OR

Opportunity

Freud knew a college who was married to an ex-client with a 5 year old son.

Self-selected

Autistic and Tourette’s groups from appropriate magazines and places of support

Random

'Normal' people chosen from a list of people who have previously said they want to take part in a study.

Opportunity

Those who came and completed the army tests.

Self-selected

Canadian prisoners who volunteered to do the study.