Question: Why is it important that a sample be random? For its validity, all hypothesis testing depends heavily on the assumption that the sample that is

Why is it important that a sample be random? For its validity, all hypothesis testing depends heavily on the assumption that the sample that is used was drawn using probability sampling techniques.
• Why is this important?
• What can you do if you just cannot use a probability sampling technique? (For example, suppose there is no good sampling frame available for the population of interest.)

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