Populations and Sampling.pptx - Populations and Sampling Lesson#7 Sampling Critical Concept In scientific experiments measure a small number of items(a

Populations and Sampling.pptx - Populations and Sampling...

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Populations and Sampling Lesson #7 Populations and Sampling Lesson #7
Sampling Sampling Critical Concept In scientific experiments, measure a small number of items (a SAMPLE ) and then infer characteristics of the entire population Why a sample? Populations are typically to large and/or not accessible For Analysis purposes, Scientist usually assume their Data is Random and use sample to estimate characteristics such as pop mean and SD Separately they analyze sources of bias and make arguments about how broad a population a sample actually represents
Sampling Sampling Other Factors: Sample Size and Distribution Sample Size Generally larger is better, more typically means sample is more valid Difficult to get large sample, (think biology) Typically a trade off due to expense and / or availability

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