A study shows the closer that participants were to an optimal sleep duration target, the better they

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A study shows the closer that participants were to an optimal sleep duration target, the better they performed on a standardized test. (Source: Eastern Economics Journal)

(a) Identify the sample used in the study.

(b) What is the population?

(c) Which part of the study represents the descriptive branch of statistics?

(d) Make an inference about the population based on the results of the study.

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