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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

Last Date of Submission:

Wednesday, 10th February, 2010.

Marks: 15

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Assignment

# 01

Marks: 15

Last Date of Submission:

Wednesday, 10th February, 2010.

Scenario

A well known investing company of Pakistan hired a number of new employees. For the sake of their training they selected two methods. One method was to introduce them with the practical work and show them the real picture of the stock exchange, how it worked. The second method was to train them through classroom training. To see the effectiveness of each method they randomly selected the new employees for each type of training. Before that they had filled out an initial questionnaire with little difficulty level to see the previous knowledge, the employees had about the stock exchange. They assigned 10 employees for each type of training. Meanwhile Pakistan television started a new program for investors. All the new employees took keen interest in that program. During the training two employees from the first ***** and one from the second ***** left the organization. Some of the employees felt that the training program was quite lengthy. After the training, organization conducted a second questionnaire with a higher difficulty level than the previous one. The employees showed the same results.

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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