Why is sampling so critical to testing hypotheses properly in scientific studies

Question
Answer all questions:

Why is sampling so critical to testing hypotheses properly in scientific studies? (Please make sure you provide sufficient detail and at least 2 examples in your answer. In your examples you should identify a topic you would research and discuss what type of sample you would pick to study that topic.)
What are the strengths and weaknesses of survey methodology? (once again, please use details and examples in your answer).
What are probability samples? Explain in your own words (details and examples must be provided).

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