Statistical Technique to Control Extraneous Variable - Management Assignment Help

Assignment Task:

Task:

•essentially this means that every person in the sample has an equal chance of being included in any of the conditions or experimental groups 
,w„t -Random Sampling: t. 
A. 11 
-is a way to select a sample that ensures it is representative of the 'Population 
-it is a statistical technique to control extraneous variables, both known and unknown 
•it ensures that every member of a population  has an equal chance of being selected for the sample 
•so it was very difficult to get equal groups, some might say even impossible 
- ICan you We ever achieve true randomization? aim for constancy on all dimensions that may nlav a role in influencing the DV, i.e. relevant 
dimensions, is likely not realistic. 

The luxury of the Lab Experiment When research is conducted in strictly controlled conditions, such as those that exist in a lab, it is much easier to control extraneous variables that may have an influence on the DV. The down side of this however is that this results in a very 
contrived artificial condition that may threaten the external validity of the research. 
Just to note: there is a difference between confounds and noise in an experiment. Confounds have the ability to influence the DV making it hard to tell how the IV is affecting the DV. Noise is the combination of extraneous variables that don't actually influence the DV because they are present at equal levels in all experimental (and control) conditions i.e. they affect all groups equally. In a lab experiment it is much easier to hold noise to a minimum. 
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Remember Artifacts? Artifacts are variables in a research study that are not one of the variables of interest but they may influence research outcomes. Quite often these artifact are created by the effort to control noise. For example making experimental participants more consistent, or homogeneous, in an effort to control noise, likely makes the participants quite unlike the population the are meant to represent. If they are not a reflection of the population they are meant to represent you will have difficulty applying the research finding to the general population and as a consequence have low external validity. 
dvantages to Experimental Research Method 

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