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Important threats to validity in quasi experimental research

Response to the following problem:

What are the most important threats to validity that occur in quasi experimental research designs when the research is conducted over a period of time? What techniques can be used to minimize these potential interpretive problems?

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## Q : Problem on linear programming model

If the objective is to maximize Z = -x1 + x2, does the model have an optimal solution? If so, find it. If not, explain why not.