e Epworth Sleepiness Scale (ESS) is a measure used to assess an individual's level of c epiness. ESS scores have a mean 7.6 and a standard deviation 5.2. A researcher is inve ether the mean ESS score of a sample of 16 participants diagnosed with obstructive sle arger than the general population. The results of this sample returned a mean of 13,5 a

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