If the experimenter expects a certain answer the person answering questions may pick up on this, which could lead to inaccuracies.
A number of problems can arise in observational studies.
If a lot is happening at once, it may be difficult to discern whether a certain result is causal or whether it would happen anyway, and if it is causal, what caused it... displayed 300 characters
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You probably wouldn't get a random group of people with this method.
There are a number of basic ethical guidelines in psychology. They were put in place to ensure that test subjects emerge unharmed from any psychological experiments.
The main premise is, therefore, the safety of the individual; this branches out into a number of separate themes... displayed next 300 characters
By answering these questions, we hope to get a better understanding of why there are so many employees leaving the company. We also hope that by answering these questions we can come up with and put a plan in place that will address these issues...
- factor or characteristic set by the researcher that is being investigates as a possible cause of a change in behaviour
- factor or characteristic being measures that is thought to be affected by a change in the value of the IV
- complete set of individuals/participants under consideration from which a sample may be drawn
- subset of the population under investigation
- everyone in population has equal chance of being selected
- avoids bias
Random Stratified Sample
- used when researchers are interested in identifying characteristics that vary between groups of people in the population
- divide population into strata and then sample randomly from each strata
- Participants selected from groups and regions that are readily available
- convenience sample
- has bias
- exposed to treatment (IV present)
- exposed to control condition (IV absent)
- provides a point of reference with which to compare experimental group
- procedure for assigning participants to various groups in an experiment
- all participants have an equal chance of being allocated to either control or experimental group
- used to ensure participants in experimental group are similar to those in the control group
Placebo and Experimenter Effects
- participant expectation
- change in behaviour caused by the belief that one has taken a drug
- single blind procedure ? participants do not know if they are in experimental or control group
- changes in participants behaviour that are caused by the unintended influence of an experimenter
- experiment finds what it expects to
- Double blind procedure ? neither the participant or the experimenter know what group the person is
- process of organising and structuring an experiment
- any potential IV that is of no direct interest to the researcher, but may have an effect on the DV
- participants take part in both experimental and control conditions
- each participant is repeatedly tested
- positive - no individual differences between participants in each condition, need less participants
- negative ? may have order effects, effects of the first condition, may artificially affect the scores of the next condition
- researcher attempts to mimic to repeated measures design but different participants are tested in each experimental condition
- to minimise participant variables, participants are matched on these variables in an attempt to remove their influence
- match participants on a variable and then randomly assign them to experimental or control group
- positive ? person only receives on condition so nor order effect
- controls for important extraneous variables
- negative ? more participants needed may still be other variables that you have not thought of which effects results
- researcher randomly allocates each participant to treatment condition
- weakest of all reducing effect of individual (participants) differences between conditions
- easy to do
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