AP Stats: Experimental and Sampling Design

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What is a convenience sample?

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A convenience sample is a type of non-probability sampling where the sample is taken from a group that is easily accessible, rather than being randomly selected from the entire population.

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What is a simple random sample?

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A simple random sample is a sampling method where every individual in the population has an equal chance of being selected.

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What is the importance of randomization in experiments?

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Randomization helps eliminate bias in assigning subjects to treatment groups, ensuring that the groups are comparable.

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What are experimental units?

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Experimental units are the smallest division of experimental material such that any two units can receive different treatments.

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What is the role of control in an experiment?

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Control is used to keep all other variables constant except for the treatment being tested, allowing for a clearer understanding of the treatment's effect.

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What is response bias?

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Response bias occurs when participants provide inaccurate or false responses, often due to the way questions are asked or the survey's design.

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What is undercoverage in sampling?

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Undercoverage occurs when some members of the population are inadequately represented in the sample.

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What is a double-blind procedure?

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A double-blind procedure is an experimental design where neither the participants nor the experimenters know who is receiving a particular treatment, reducing bias.

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What is a placebo group?

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A placebo group is a control group that receives a treatment with no therapeutic effect, allowing researchers to compare the effects of the actual treatment.

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What is blocking in experimental design?

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Blocking is a technique used to group similar experimental units together to reduce variability in the results.