AP Stats: Experimental and Sampling Design

Front

What are the two essential features of all statistically designed experiments?

Back

Compare several treatments and use chance to assign subjects to treatments.

Front

What is response bias in surveys?

Back

Response bias occurs when the responses given by participants are influenced by the way questions are asked or by the participants' characteristics.

Front

What are the important factors in designing an experiment?

Back

I. Control of all variables that might influence the response variable. II. Randomization of subjects to treatment groups.

Front

What type of sample is obtained when a random sample of schools is selected and every student in those schools is surveyed?

Back

Cluster sample.

Front

What is the role of control groups in experiments?

Back

Control groups help to isolate the effect of the treatment by providing a baseline for comparison.

Front

What is randomization in the context of experimental design?

Back

Randomization is the process of randomly assigning subjects to different treatment groups to eliminate bias.

Front

What is a placebo group?

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A placebo group is a group of subjects that receives a placebo treatment, which is an inactive substance, to compare against the treatment group.

Front

What is the difference between observational studies and experiments?

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Observational studies observe subjects without manipulation, while experiments involve the manipulation of variables to determine cause and effect.

Front

What is a simple random sample (SRS)?

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

Front

What is a stratified sample?

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A stratified sample is obtained by dividing the population into subgroups and randomly sampling from each subgroup.