Data gathered is more likely to be focused on the purpose of the research
Less peripheral/redundant information
Control issues – first hand data can be controlled whereas secondary data may have been gathered under differing conditions
characteristics of Mann Whitney U
testing for difference
independant design
ordinal data
advantage of using repeated measures
Control for individual differences so that the researcher can be more certain that the effect is not due to characteristics such as gender, personality etc
advantage of using a lab experiment
Control over extraneous variables. The lab setting meant that extraneous variables could be minimised. In this experiment, outside factors such as waiting time, noise and stress were removed.
Ethical issues. In this case, the testing of memory in a field experiment would have involved ethical issues including deception of patients or withholding of information.
why would you use chi squared
design is unrelated/independent groups/independent data
the researcher is looking for a difference (between two conditions/sets of data) or an association/relationship (between two variables).
