A2.S-IC.B.3

Recognize the purposes of and differences between designed experiments, sample surveys and observational studies.

Example Problems
A school chooses 3 randomly selected athletes from each of its sports teams to participate in a survey about athletics at the school.

What type of sample is this: simple random sample, stratified random sample, cluster random sample, or systematic random sample?
An airline company wants to survey its customers one day, so they randomly select 5 flights that day and survey every passenger on those flights.

What type of sample is this: simple random sample, stratified random sample, cluster random sample, or systematic random sample?
A delivery company evaluates service on a given day. It randomly selects 8 delivery routes that day and contacts every customer served on those routes.

What type of sample is this: simple random sample, stratified random sample, cluster random sample, or systematic random sample?
Khan Academy Resources
The language of experimentsPrinciples of experiment designSimulation and randomness: Random digit tablesRandom sampling vs. random assignment (scope of inference)Sampling methodsConclusions in observational studies versus experimentsSimple random samplesExperiment designsSampling method considerationsExperiment design considerationsTypes of studiesFinding errors in study conclusionsSystematic random samplingMatched pairs experiment designIntroduction to experiment designInvalid conclusions from studies exampleCan causality be established from this study?Techniques for random sampling and avoiding biasWorked example identifying observational studyTechniques for generating a simple random sampleTypes of studies
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