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In a recent study of possible performance-enhancing effects among competitive cyclists,it was found that caffeine administration increased their performance during timed trials overall,but the effect was greater when the cyclists were (falsely)informed that they had not ingested it.
Population Mean
The average value of a set of characteristics (e.g., measurements, scores) for an entire population, calculated as the sum of all values divided by the number of values.
Confidence Interval
A statistical estimate of the range within which an unknown population parameter lies, calculated to express the certainty of its covering the true value.
Confidence Interval
A series of values, based on sample statistics, presumed to include the unknown value of a population parameter.
Population Parameter
A characteristic or measure that describes an aspect of an entire population, such as a population mean or variance.
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