The likelihood a given sample comes from a given population
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Name 2 ways to reduce overlap between distributions
1. Increase BGV, 2. decrease WGV
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Why decrease overlap between distributions?
More likely to find statistical significance
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How can you increase BGV?
Increase strength of manipulation
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How can you decrease WGV?
Increase precision e.g. milligrams instead of grams, Reduce heterogenity in sample (make inclusion/exclusion criteria more stringent) and Increase sample size to give better estimation of mean.
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What is a type 1 error
Null is inappropriately rejected (error of specificity)
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What is a type 2 error?
Fail to reject null when we should reject it (error of sensitivity)
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What happens to variability when sample size increases?
Variability decreases as people's scores closer to mean.
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What is the sample variance likely to do to the true population variance?
Likely to underestimate true population variance.
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Name 2 ways to reduce overlap between distributions
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