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Across
A test where you create a questionnaire to gather your results
All members of the population are equally likely to be chosen
Select only members of the population who volunteer
A set of data that models an event that can happen in real life
Down
Order the population in some way and select regular intervals
Select any members that are convenient and readily available
A study where you do not alter the results or test the variables
A study where you test the variable
Combining two or more issues, using double negatives, overlapping answer choices, suggested answers, words with strong reactions.