A researcher wanted to study the strategic vigilance and its impact on enhancing the competitiveness of telecommunications and information technology companies in Palestine during the year $2022.$ strategic vigilance variables were identified through $($Technological vigilance, Competitive vigilance, commercial vigilance, environmental vigilance$).$ The researcher will collect the data of the study using a questionnaire that will be distributed to the workers in these companies, and will distinguish between them in terms of: gender $($male $/$ female$),$ age $($less than $30$ years, between $31-45$ years, over $45$ years$),$ and educational qualification $($high school and below, Bachelor's, Postgraduate$).$

Based on the above, determine the following:

$9)$ Clarifying the methodology of the study, in terms of:

$$ Type of study.

$$ Study population.

$$ The study sample $($its type and how to choose it$).$

$$ Study subject.

$$ Sources and tools for data collection.

$$ Appropriate statistical methods.

$10)$ The three most important results of the study.

$10)$ The three most important recommendations that can be made.

$12)$ To confirm the results, the company asked you to design an experiment to ensure that the independent variable causes the dependent variable. Based on that, show:

$$ Appropriate experiment to confirm this.

$$ How to implement the experiment.

$$ Explain what is meant by internal and external confidence.

$$ What are the conditions that must be met to prove that the independent variable is causing the dependent variable?

$$ Explain how the external polluting factors can be controlled for the experiment.