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Statistics - Least Squares Regression

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For the leading health maintenance organization (HMO) firms, the attachment lists the number of persons enrolled in the HMO along with the number of plans that firm administers. Given these dates, determine the least-squares equation for predicting the total enrollment as a function of the number of plans administered. What would be the estimated total enrollment for an HMO firm that administered 20 plans? (Please see attached file)

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