SOLUTION:
In this scenario,following threats to internal validity exist:
History effects
In the scenario above , Pakistan television program was the history effect which was an external even out of control of management.All the employees take much interest in that program due to which the validity of the training influence adversely.
Maturation effect
In the scenario above , the length of time was too much according to some employees .And 3 employees left the training due to the fact that they were getting bored from training program..Thats why this threat to internal validity exist in scenario.
Testing effect
This effect also exist in this scenario ,As the questions asked in pretest influence the performance of employees adversely.
Instrumentation effect
This is another threat to internal validity which exist in this scenario.
Mortality
Mortality effect of threat to the internal validity exist I this scenario , as some of the employees left organization during program .Which contaminate the program because leaving of some members hinder the training process and make it difficult to intreprete the exact result.
Following threats to internal validity does not exist in the scenario above.
Selection bias effect
This is the threat which exist due to non random selection of subjects for 2 comparison groups.Whereas in scenario above members of 2 groups were selected randomly.So, there was no selection differentiation in scenario.
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Semester Fall 2009
Research Methods (STA630)
Assignment No. 1
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Assignment
# 01
Marks: 15
Last Date of Submission:
Scenario
A well known investing company of
Questions:
In this scenario, whether the following threats to internal validity exist? Why or why not, support your answer with logic.
A.
History effects
B.
Maturation effect
C.
Testing effect
D.
Instrumentation effect
E.
Selection bias effect
F.
Statistical regression
G.
Mortality
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