Research Issues, Controls & Pilot Studies (AQA A Level Psychology)

The psychologist was interested in finding out whether dream themes differed between males and females, particularly in terms of social interaction. She decided to conduct a pilot study.

Twenty undergraduate students (8 male and 12 female) volunteered for the study. For a six-week period the students were interviewed at 9 am each morning when they arrived at university. Interviewers, who did not know the purpose of the study, carried out and recorded the dream interviews.

What is meant by a pilot study? Explain one possible reason why the psychologist decided to conduct a pilot study for this investigation.

What are investigator effects? Suggest one way in which they could have been minimised during the dream interviews.

In an experiment, researchers arranged for participants to complete a very personal and embarrassing questionnaire in a room with other people. Each participant was tested individually. The other people were confederates of the experimenter.

In condition 1: the confederates completed the questionnaire.

In condition 2: the confederates refused to complete the questionnaire and asked to leave the experiment.

The researchers tested 15 participants in condition 1, and 15 different participants in condition 2.

The researchers recorded the number of participants who completed the questionnaire in each condition.

For this study, the researchers had to use different participants in each condition and this could have affected the results.

Outline one way in which the researchers could have addressed this issue.

A controlled observation was designed to compare the social behaviours of pre-school children of working parents and pre-school children of stay-at-home parents. The sample consisted of 100 children aged three, who were observed separately. Half of the children had working parents and the other half had stay-at-home parents.

The observation took place in a room which looked like a nursery, with a variety of toys available. In the room, there were four children and one supervising adult. Their behaviour was not recorded.

Each child participant was brought into the room and settled by their parent. The parent then left to sit outside. Each child participant’s behaviour was observed covertly for five minutes while they played in the room.

The observation was conducted in a controlled environment and a standardised script was used when the children and their parents arrived.

Explain why the researcher used a controlled observation and a standardised script in this study.

In a study into the effectiveness of a new drug therapy for schizophrenia, researchers gave one group of patients the new drug and another group of patients a placebo (a pretend drug).

The researchers were concerned that the outcome of the study might be influenced by the problems of demand characteristics and investigator effects.

Explain what the researchers could do to eliminate or reduce demand characteristics and investigator effects in this study.