An Experimenter Conducts a Study in Which She Wants to Investigate

question 24

Multiple Choice

An experimenter conducts a study in which she wants to investigate the effects of eating chocolate on concentration.To do this she gives 20 people in an experimental condition a bar of chocolate and gives another 20 people in a control group nothing.However 4 of the people in the experiment withdraw because the dislike chocolate.Which of the following is a threat to internal validity?

• A)Regression to the mean.
• B)Practice effects.
• C)Demand characteristics.
• D)Mortality effects.
• E)Experimenter bias.