Employee Sick Days Suppose that the human resources manager for a large company suspects that employees might be abusing the company's sick day policy by taking an inordinate number of sick days on Mondays and Fridays in order to enjoy a long weekend. She decides to investigate this issue by taking a random sample of sick days and determining the proportion of the sick days that were taken on a Monday or Friday. a. Identify the observational units in this study.

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