Stratified sampling does not involve simple random sampling.
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Q4: A placebo is designed to be identical
Q5: A study is an observational study if
Q6: A treatment is a particular combination of
Q7: Random assignment to treatments will guarantee that
Q8: Response bias occurs when responses are not
Q10: If the sample size is small relative
Q11: In a well-designed experiment the treatments are
Q12: Variables are extraneous if their effects on
Q13: Blocking is used to filter out the
Q19: The method of control wherein an extraneous
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