repetition of the methods used in a previous experiment to see whether the same methods will have the same results
Independent variable (IV)
the factor the researcher manipulates in a controlled experiment, this changes (the amount of alcohol)
Dependent variable (DV)
this is what the experimenter measures. (the results)
all of the individuals in the group to which the study applies
choosing of members of a population so that every individual has an equal chance of being chosen
the comparison group
factors that cause differences between the experimental group and the control group other than the independent variable
consistency or repeatability of results, make sure all the results are valid
the extent to which an instrument measures or predicts what is is supposed to measure or predict
this is where we have two groups, if our experiment was for example drink driving we would provide one group of people with alcohol and the other without.
this is were we sort through all the participants and sort the same skilled people in different groups
where one group of people do both parts of the experiment
two groups that take part in both the drink and none drink on different day
where we tell the participants as much information, we have to be careful of people with brain damage, had a stroke etc.
we cant device people unless it is vital for the experiment, but you have to think carefully.
they participants have to be allowed to leave at any time. we need to remind them of this fact at the beginning and end of the experiment
Avoiding harm (protection)
the experimenter is not allowed to cause stress or harm to the participant. They have to leave in the same state they arrived in.
at the end of the study you talk to the participant about the results and what it is you have been doing and make sure they are happy and have no questions. they are also allowed to take their results back if they are not happy.
we cant use the names of the participants and we have to make sure they are not identifiable
we cant watch people unless they are in a public place.
Non directional hypotheses
when you do not know what is going to happen - there will be a significant difference in...
we can guess what is going to happen - participants who...
- there will be no significant difference ....
long detailed answer
check lists, placing items in rank order, attitude scale(agree,disagree), linkert scale (tick 1-5)
get anybody (family+friends)
put an advert somewhere asking for specific people to take part
descriptive and detailed data